`az vm create`: when `--patch-mode` is set but not `--enable-agent`, vm creation fails with `KeyError: 'linuxConfiguration'`.

### Describe the bug

When creating a VM with `az vm create`, if `--patch-mode` is set but not `--enable-agent`, vm creation fails with message `'linuxConfiguration'`.

`--debug` option shows it fails with `KeyError` at the following line:
https://github.com/Azure/azure-cli/blob/aea0ce91218f13960232f76f458796555f68eb1b/src/azure-cli/azure/cli/command_modules/vm/_template_builder.py#L381

`os_profile['linuxConfiguration']` is set only if `enable_agent` is not `None` or `ssh_key_values` and `ssh_key_path` are given. We must initialize `os_profile['linuxConfiguration']` (and `os_profile['windowsConfiguration']` for Windows VM) before setting `patchSettings`.

We must fix `build_vm_resource` and `build_vmss_resource`.

### Related command

az vm create

### Errors

The command fails with just `'linuxConfiguration'`. See "Issue script & Debug output" for details.

### Issue script & Debug output

Command:
```
RESOURCE_GROUP=example-resource-group
az vm create \
--validate \
--name "test" \
--resource-group "$RESOURCE_GROUP" \
--image Ubuntu2204 \
--admin-password 123456789aA_ \
--patch-mode ImageDefault \
--debug
```

Debug output (only errors):
```
cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 701, in _run_job
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 334, in __call__
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 121, in handler
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/vm/custom.py", line 1097, in create_vm
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/vm/_template_builder.py", line 589, in build_vm_resource
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/vm/_template_builder.py", line 381, in _build_os_profile
KeyError: 'linuxConfiguration'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/arm.py", line 109, in handle_template_based_exception
AttributeError: 'KeyError' object has no attribute 'inner_exception'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 664, in execute
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 731, in _run_jobs_serially
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 723, in _run_job
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/arm.py", line 114, in handle_template_based_exception
knack.util.CLIError: 'linuxConfiguration'

cli.azure.cli.core.azclierror: 'linuxConfiguration'
az_command_data_logger: 'linuxConfiguration'
```

### Expected behavior

The command finishes without errors.

### Environment Summary

```
azure-cli 2.58.0 *

core 2.58.0 *
telemetry 1.1.0

Extensions:
aks-preview 1.0.0b3
azure-devops 0.26.0
azure-firewall 1.0.1
bastion 0.3.0
log-analytics 0.2.2
logic 1.0.1
ssh 2.0.2

Dependencies:
msal 1.26.0
azure-mgmt-resource 23.1.0b2

Python location 'C:\Users\yonezawa\scoop\apps\azure-cli\current\python.exe'
Extensions directory 'C:\Users\yonezawa\.azure\cliextensions'

Python (Windows) 3.11.7 (tags/v3.11.7:fa7a6f2, Dec 4 2023, 19:24:49) [MSC v.1937 64 bit (AMD64)]

Legal docs and information: aka.ms/AzureCliLegal

You have 2 update(s) available. Consider updating your CLI installation with 'az upgrade'
```

### Additional context

_No response_