Auto Assessment job terminated with SIGTERM after ~90s due to systemd start timeout and the service type model

**Describe the bug**
MsftLinuxPatchAutoAssess.service is created with Type=forking, but the script runs Python in the foreground and never daemonizes. systemd waits for the fork-and-exit signal, hits the default TimeoutStartSec=90s, and SIGTERMs the cgroup. On any host where Python startup + the first package-manager call exceeds 90s, every auto-assessment is killed before it writes a result and the Portal shows "Pending" forever.
The same unit template is written for all distros - issue is latent everywhere, only reliably reproducible on slow hosts.

**To Reproduce**
1. RHEL 8.4 VM (Arc or Azure) as example
2. Make yum slow enough to exceed 90s. Wrap /usr/bin/yum:
```
# wrap yum so every call sleeps 120 min first
sudo mv /usr/bin/yum /usr/bin/yum.real
sudo tee /usr/bin/yum >/dev/null <<'EOF'
#!/bin/bash
sleep 120
exec /usr/bin/yum.real "$@"
EOF
sudo chmod +x /usr/bin/yum
```
3. Install the extension, enable auto-assessment (assessmentMode=AutomaticByPlatform)
4. sudo systemctl start MsftLinuxPatchAutoAssess.service
5. journalctl -u MsftLinuxPatchAutoAssess.service

**Expected behavior**
Assessment runs to completion. .status flips from Transitioning to success.

**Actual behavior**
SIGTERM at exactly T+90s, MainPID=0, Result: failed (timeout). Status stays Transitioning indefinitely:

```
Jun 04 15:17:01 lab.opsmgr.net sudo[120526]: root : TTY=pts/1 ; PWD=/opt/lpe-repro/runtime/config ; USER=root ; COMMAND=/bin/systemctl start MsftLi nuxPatchAutoAssess.service
Jun 04 15:17:01 lab.opsmgr.net sudo[120526]: pam_unix(sudo:session): session opened for user root by root(uid=0)
Jun 04 15:17:01 lab.opsmgr.net systemd[1]: Starting Microsoft Azure Linux Patch Extension - Auto Assessment...
Jun 04 15:17:16 lab.opsmgr.net sudo[120562]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/id
Jun 04 15:17:16 lab.opsmgr.net systemd[1]: Started Session c128 of user root.
Jun 04 15:17:16 lab.opsmgr.net sudo[120562]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 15:17:16 lab.opsmgr.net sudo[120562]: pam_unix(sudo:session): session closed for user root
Jun 04 15:17:16 lab.opsmgr.net systemd[1]: session-c128.scope: Succeeded.
Jun 04 15:17:16 lab.opsmgr.net sudo[120566]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum -q check-update
Jun 04 15:17:16 lab.opsmgr.net systemd[1]: Started Session c129 of user root.
Jun 04 15:17:16 lab.opsmgr.net sudo[120566]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 15:18:01 lab.opsmgr.net systemd[1]: Started Session 3800 of user root.
Jun 04 15:18:01 lab.opsmgr.net systemd[1]: session-3800.scope: Succeeded.
Jun 04 15:18:31 lab.opsmgr.net systemd[1]: MsftLinuxPatchAutoAssess.service: start operation timed out. Terminating.
Jun 04 15:18:31 lab.opsmgr.net systemd[1]: MsftLinuxPatchAutoAssess.service: Failed with result 'timeout'.
Jun 04 15:18:31 lab.opsmgr.net sudo[120526]: pam_unix(sudo:session): session closed for user root
Jun 04 15:18:31 lab.opsmgr.net systemd[1]: Failed to start Microsoft Azure Linux Patch Extension - Auto Assessment.
```

**Screenshots**
N/A.

**Desktop (please complete the following information):**
• OS: RHEL 8.4 (reproduced); latent on all supported distros, same template is written unconditionally
• Cloud type: Arc-enabled (same code path as Azure)
• systemd: 239+ (default TimeoutStartSec=90s)
• Affected file: ServiceManager.py → create_service_unit_file()

**Smartphone (please complete the following information):**
N/A.

**Additional context**
**Root cause**
Type=forking requires the parent to fork a daemon child and exit before TimeoutStartSec. The script does neither. systemd's contract is violated → cgroup killed.

**Proposed fix**
In ServiceManager.create_service_unit_file():
• Type=forking → Type=simple (matches what the script actually does)
• Add TimeoutStartSec=0 (no meaningful start-gate for simple)
• Add RuntimeMaxSec=1800 (30-min safety cap against runaway hangs)

**Validated on repro box after fix (~10 min execution to complete with success)**
```
Jun 04 23:44:56 lab.opsmgr.net systemd[1]: Started Microsoft Azure Linux Patch Extension - Auto Assessment.
Jun 04 23:45:11 lab.opsmgr.net sudo[3486]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/id
Jun 04 23:45:11 lab.opsmgr.net sudo[3486]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:45:11 lab.opsmgr.net sudo[3486]: pam_unix(sudo:session): session closed for user root
Jun 04 23:45:12 lab.opsmgr.net sudo[3490]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum -q check-update
Jun 04 23:45:12 lab.opsmgr.net sudo[3490]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:47:13 lab.opsmgr.net sudo[3564]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum -q --security check-update
Jun 04 23:47:14 lab.opsmgr.net sudo[3564]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:49:15 lab.opsmgr.net sudo[3608]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum -y install yum-utils
Jun 04 23:49:15 lab.opsmgr.net sudo[3608]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:51:17 lab.opsmgr.net sudo[3669]: root : PWD=/opt/lpe-repro ; USER=root ; ENV=LANG=en_US.UTF8 ; COMMAND=/bin/needs-restarting -r
Jun 04 23:51:17 lab.opsmgr.net sudo[3669]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:51:18 lab.opsmgr.net sudo[3669]: pam_unix(sudo:session): session closed for user root
Jun 04 23:51:18 lab.opsmgr.net sudo[3674]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum -y install yum-plugin-ps
Jun 04 23:51:18 lab.opsmgr.net sudo[3674]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:53:20 lab.opsmgr.net sudo[3718]: root : PWD=/opt/lpe-repro ; USER=root ; COMMAND=/bin/yum ps
Jun 04 23:53:20 lab.opsmgr.net sudo[3718]: pam_unix(sudo:session): session opened for user root by (uid=0)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Bootstrap environment: Prod
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Building bootstrap container configuration...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Trying to connect IMDS end point. url:http://169.254.169.254/metadata/instance/compute?api-version=2019-06-01.
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Connecting to IMDS endpoint...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Exception from IMDS connection http request: URLError(ConnectionRefusedError(111, 'Connection refused'),)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Failed to connect to IMDS end point. [Trial=1].
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Connecting to IMDS endpoint...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Exception from IMDS connection http request: URLError(ConnectionRefusedError(111, 'Connection refused'),)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Failed to connect to IMDS end point. [Trial=2].
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Connecting to IMDS endpoint...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Exception from IMDS connection http request: URLError(ConnectionRefusedError(111, 'Connection refused'),)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Failed to connect to IMDS end point. [Trial=3].
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Connecting to IMDS endpoint...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Exception from IMDS connection http request: URLError(ConnectionRefusedError(111, 'Connection refused'),)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Failed to connect to IMDS end point. [Trial=4].
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Connecting to IMDS endpoint...
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Exception from IMDS connection http request: URLError(ConnectionRefusedError(111, 'Connection refused'),)
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: - Failed to connect to IMDS end point. [Trial=5].
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Failed to connect IMDS end point after 5 retries. This is expected in Arc VMs. VMCloudType is set to Arc.
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: --------------------------------------------------------------------------------------------------------------------------------
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: ,---. ,---. | | ,-.-. |
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: |---|,---,. .,---.,---. |---',---.|--- ,---.|---. | | |,---.,---.,---.,---.,---.,-.-.,---.,---.|---
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: | | .-' | || |---' | ,---|| | | | | | |,---|| |,---|| ||---'| | ||---'| ||
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: ` ''---'`---'` `---' ` `---^`---'`---'` ' ` ' '`---^` '`---^`---|`---'` ' '`---'` '`---'
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: `---'
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: --------------------------------------------------------------------------------------------------------------------------------
Jun 04 23:55:20 lab.opsmgr.net MsftLinuxPatchAutoAssess.sh[3453]: Completed building bootstrap container configuration.
Jun 04 23:55:20 lab.opsmgr.net systemd[1]: MsftLinuxPatchAutoAssess.service: Succeeded.
```

Status flipped **Transitioning** to **success**; AssessmentState.json.lastStartInSecondsSinceEpoch updated correctly.

Bắt đầu trong ServiceManager.py tại create_service_unit_file() và kiểm tra template MsftLinuxPatchAutoAssess.service được tạo ra, sau đó tái hiện việc khởi động yum bị trì hoãn được mô tả trên RHEL 8.4. Được xem là hoàn tất khi dịch vụ không bị dừng ở giây thứ 90, quá trình đánh giá hoàn tất và AssessmentState.json.lastStartInSecondsSinceEpoch được cập nhật với trạng thái đạt success.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.