Add more details to VM deployment failure alert messages

[GaOrtiga]

Description

This PR improves the details provided in the logs and in the alert email sent when a VM fails to deploy.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

[sureshanaparti]

@blueorangutan package

[blueorangutan]

@sureshanaparti a [SL] Jenkins job has been kicked to build packages. It will be bundled with no SystemVM templates. I'll keep you posted as I make progress.

[Copilot]

Pull request overview

This PR enhances VM deployment failure diagnostics by improving the log lines and the alert email content generated when VM creation fails, aiming to make troubleshooting easier.

Changes:

• Refines log messages during failed VM deployment cleanup (VM/volume destruction path).
• Updates the VM deployment failure alert to use a dedicated subject/body and include a log context id reference.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 18.00%. Comparing base (5d61ba3) to head (d17a813).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../src/main/java/com/cloud/vm/UserVmManagerImpl.java	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12939      +/-   ##
============================================
- Coverage     18.02%   18.00%   -0.02%     
+ Complexity    16466    16459       -7     
============================================
  Files          5973     5976       +3     
  Lines        537466   537587     +121     
  Branches      65991    66007      +16     
============================================
- Hits          96855    96802      -53     
- Misses       429689   429873     +184     
+ Partials      10922    10912      -10     

Flag	Coverage Δ
uitests	3.52% <ø> (ø)
unittests	19.17% <0.00%> (-0.02%)	⬇️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17321

[erikbocks]

Just a minor regard
CLGTM