Error while capturing windows vhd builds (any)

#### Overview of the Issue

We are unable to capture/build windows vhd using packer with azure plugin version `2.5.1`. Works fine in `2.5.0`

#### Reproduction Steps

Try building Windows VHD builds any version/flavour using 2.5.1. Here is the following error produced by packer

```
2025/12/19 19:38:21 packer-provisioner-powershell plugin: Opening vhdbuilder/packer/windows/sysprep.ps1 for reading
2025/12/19 19:38:21 packer-provisioner-powershell plugin: Uploading env vars to c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1
2025/12/19 19:38:21 packer-provisioner-powershell plugin: [INFO] 74 bytes written for 'uploadData'
2025/12/19 19:38:21 [INFO] 74 bytes written for 'uploadData'
2025/12/19 19:38:21 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:38:21 Uploading file to 'c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1'
2025/12/19 19:38:23 packer-provisioner-powershell plugin: Building elevated command wrapper for: powershell -executionpolicy bypass "& { if (Test-Path variable:global:ProgressPreference){set-variable -name variable:global:ProgressPreference -value 'SilentlyContinue'};. c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1; &'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'; exit $LastExitCode }"
2025/12/19 19:38:23 packer-provisioner-powershell plugin: Command [powershell -executionpolicy bypass "& { if (Test-Path variable:global:ProgressPreference){set-variable -name variable:global:ProgressPreference -value 'SilentlyContinue'};. c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1; &'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'; exit $LastExitCode }" > %SYSTEMROOT%/Temp/packer-6945a9af-1796-743a-92b2-6207cd7d5396.out 2>&1] converted to [powershell -executionpolicy bypass "& { if (Test-Path variable:global:ProgressPreference){set-variable -name variable:global:ProgressPreference -value 'SilentlyContinue'};. c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1; &'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'; exit $LastExitCode }" > %SYSTEMROOT%/Temp/packer-6945a9af-1796-743a-92b2-6207cd7d5396.out 2>&1] for use in XML string
2025/12/19 19:38:23 packer-provisioner-powershell plugin: Uploading elevated shell wrapper for command [powershell -executionpolicy bypass "& { if (Test-Path variable:global:ProgressPreference){set-variable -name variable:global:ProgressPreference -value 'SilentlyContinue'};. c:/Windows/Temp/packer-ps-env-vars-6945a4db-1f59-c78d-69ef-c93748b28386.ps1; &'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'; exit $LastExitCode }" > %SYSTEMROOT%/Temp/packer-6945a9af-1796-743a-92b2-6207cd7d5396.out 2>&1] to [C:/Windows/Temp/packer-elevated-shell-6945a9af-f9f7-cd91-021b-607af7c43b9e.ps1]
2025/12/19 19:38:23 packer-provisioner-powershell plugin: [INFO] 3522 bytes written for 'uploadData'
2025/12/19 19:38:23 [INFO] 3522 bytes written for 'uploadData'
2025/12/19 19:38:23 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:38:23 Uploading file to 'C:/Windows/Temp/packer-elevated-shell-6945a9af-f9f7-cd91-021b-607af7c43b9e.ps1'
2025/12/19 19:38:24 packer-provisioner-powershell plugin: [INFO] 2087 bytes written for 'uploadData'
2025/12/19 19:38:24 [INFO] 2087 bytes written for 'uploadData'
2025/12/19 19:38:24 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:38:24 Uploading file to 'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'
2025/12/19 19:38:25 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:38:25 [INFO] starting remote command: powershell -executionpolicy bypass -file "C:/Windows/Temp/packer-elevated-shell-6945a9af-f9f7-cd91-021b-607af7c43b9e.ps1"
2025-12-19T19:38:26Z: ==> azure-arm: WindowsAzureGuestAgent is still running, trying to stop now.
2025-12-19T19:38:28Z: ==> azure-arm: WARNING: Waiting for service 'Windows Azure Guest Agent (WindowsAzureGuestAgent)' to stop...
2025-12-19T19:38:30Z: ==> azure-arm: WARNING: Waiting for service 'Windows Azure Guest Agent (WindowsAzureGuestAgent)' to stop...
2025-12-19T19:38:35Z: ==> azure-arm: WARNING: Waiting for service 'RdAgent (RdAgent)' to stop...
2025-12-19T19:38:37Z: ==> azure-arm: WARNING: Waiting for service 'RdAgent (RdAgent)' to stop...
2025-12-19T19:38:37Z: ==> azure-arm: [SC] DeleteService SUCCESS
2025-12-19T19:38:37Z: ==> azure-arm: [SC] DeleteService SUCCESS
2025-12-19T19:38:37Z: ==> azure-arm: Removing 5c6d8a0e-cfe2-4dbb-9db3-bea0640e12a4 - C:\Windows\system32\VMAgentDisabler.dll,SysprepProviderEntryPoint
2025-12-19T19:38:37Z: ==> azure-arm: IMAGE_STATE_COMPLETE
2025/12/19 19:39:47 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:39:47 [INFO] command 'powershell -executionpolicy bypass -file "C:/Windows/Temp/packer-elevated-shell-6945a9af-f9f7-cd91-021b-607af7c43b9e.ps1"' exited with code: 0
2025/12/19 19:39:47 [INFO] 566 bytes written for 'stdout'
2025/12/19 19:39:47 [INFO] 0 bytes written for 'stderr'
2025/12/19 19:39:47 packer-provisioner-powershell plugin: [INFO] 566 bytes written for 'stdout'
2025/12/19 19:39:47 packer-provisioner-powershell plugin: Retryable error: unknown error Post "https://172.1.0.10:5986/wsman": read tcp 172.0.0.113:48238->172.1.0.10:5986: read: connection reset by peer
2025/12/19 19:39:47 packer-provisioner-powershell plugin: [INFO] 0 bytes written for 'stderr'
2025/12/19 19:39:49 packer-provisioner-powershell plugin: [INFO] 2087 bytes written for 'uploadData'
2025/12/19 19:39:49 [INFO] 2087 bytes written for 'uploadData'
2025/12/19 19:39:49 packer-plugin-azure_v2.5.1_x5.0_linux_amd64 plugin: 2025/12/19 19:39:49 Uploading file to 'c:/Windows/Temp/script-6945a4db-cf9e-bc62-f569-c2f28579c67b.ps1'
2025/12/19 19:40:19 packer-provisioner-powershell plugin: Retryable error: Error uploading script: Error uploading file to $env:TEMP\winrmcp-07c23f51-0aaa-45ac-66bc-d7182efdc6d7.tmp: Couldn't create shell: unknown error Post "https://172.1.0.10:5986/wsman": dial tcp 172.1.0.10:5986: i/o timeout
2025/12/19 19:40:21 packer-provisioner-powershell plugin: [INFO] 2087 bytes written for 'uploadData'
2025/12/19 19:40:21 [INFO] 2087 bytes written for 'uploadData'
```

### Plugin and Packer version
Packer version: `Packer v1.14.3`
Plugin azure: `2.5.1`

Works fine with `2.5.0`, unable to figure out if anything changed here in building windows VHD https://github.com/hashicorp/packer-plugin-azure/compare/v2.5.0...v2.5.1

### Simplified Packer Buildfile

Sorry do not have any since our packer file includes PII

### Operating system and Environment details

Ubuntu 22 building a windows VHD

### Log Fragments and crash.log files

Included above

Start by reproducing a Windows VHD build on Ubuntu 22 with Packer v1.14.3 and Azure plugin 2.5.1, using the supplied logs and the known-working 2.5.0 version as a comparison. Inspect the changes between v2.5.0 and v2.5.1 around Windows guest-agent shutdown and WinRM handling; done means 2.5.1 completes the build without the connection reset or timeout.

Written by the indexing model from the issue text.