test(vm_extensions): add CustomScript boot validation test case

[Jape96]

What

Adds a minimal, self-contained Custom Script VM extension boot validation test case to CustomScriptTests (lisa/microsoft/testsuites/vm_extensions/runtime_extensions/custom_script.py).

Details

• Installs the extension with a single inline commandToExecute (echo 'CSE test success') and no fileUris — so it requires no storage account and no public blob access (unlike the existing public/private cases that were downgraded to priority 5 due to blob public-access restrictions).
• Asserts provisioning_state == "Succeeded", then removes the extension.
• Publisher / type / version are read from runbook variables (extension_publisher, extension_type, extension_version), defaulting to the Custom Script extension — same pattern as GenericVmExtension.verify_vm_extension_install_uninstall.
• Deployed extension instance name follows <publisher>_<extension_type>_boot_validation_test.

Testing

Ran end-to-end on Azure (Ubuntu 22.04, real VM deploy):

CustomScriptTests.microsoft_azure_extensions_customscript_boot_validation_test: PASSED
FAILED: 0  PASSED: 1  SKIPPED: 0

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

[Copilot]

Pull request overview

Adds a new, minimal Custom Script VM extension “boot validation” test to the existing CustomScriptTests suite to validate that installing the extension with only an inline commandToExecute succeeds (no fileUris / storage dependency), and then removes the extension.

Changes:

• Added microsoft_azure_extensions_customscript_boot_validation_test to install Custom Script extension (publisher/type/version optionally overridden via runbook variables) and assert provisioning_state == "Succeeded".
• Uses a dedicated extension instance name (<publisher>_<extension_type>_boot_validation_test) and performs pre/post delete to avoid conflicts.

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[Jape96]

Addressed in 25ca6b17f: wrapped the install + provisioning-state assertion in try/finally so extension.delete(..., ignore_not_found=True) always runs, even if create_or_update raises or the assertion fails. This guarantees the extension is cleaned up and not left on the VM for subsequent tests.