Defer missing clayer file handling during context parsing

[brondani]

Fixes

• Generate *.cbuild-mlops.yml even a project component is missing #2578

Changes

• Record missing .clayer.yml files in m_missingFiles instead of attempting to parse them.
• Skip "to-be-generated" file: do not report error if missing layer file is listed as an output of an execute node.
• Add unit-test coverage verifying missing clayer files are deferred and do not fail context-layer parsing.

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[Copilot]

🟢 Approval recommended

The change is small, aligns with the stated behavior for deferring missing layer handling, and includes targeted unit test coverage for the new flow.

Pull request overview

This PR adjusts ProjMgr’s context-layer parsing so missing explicit .clayer.yml files no longer cause an immediate parsing failure; instead they are recorded as missing and handled later, enabling downstream generation steps to proceed (per issue #2578).

Changes:

• Defer handling of missing explicit layer files by recording them in m_missingFiles and skipping parsing in ParseContextLayers.
• Add a unit test ensuring missing .clayer.yml files are deferred (no parse failure, no context.clayers entry) and are tracked in m_missingFiles.

File summaries

File	Description
tools/projmgr/src/ProjMgrWorker.cpp	Defers missing explicit layer file handling by tracking missing files instead of parsing.
tools/projmgr/test/src/ProjMgrWorkerUnitTests.cpp	Adds unit test validating deferred handling and missing-file tracking for absent .clayer.yml.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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[github-actions]

Test Results

  2 files   14 suites   14m 57s ⏱️
482 tests 482 ✅ 0 💤 0 ❌
964 runs  964 ✅ 0 💤 0 ❌

Results for commit bbf31d4.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.13%. Comparing base (fdcbbe9) to head (bbf31d4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2580      +/-   ##
==========================================
- Coverage   72.16%   72.13%   -0.03%     
==========================================
  Files         185      185              
  Lines       30253    30255       +2     
  Branches    17845    17846       +1     
==========================================
- Hits        21831    21824       -7     
- Misses       6110     6116       +6     
- Partials     2312     2315       +3     

Flag	Coverage Δ
projmgr-cov	87.94% <100.00%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrWorker.cpp	87.40% <100.00%> (-0.10%)	⬇️

... and 1 file with indirect coverage changes

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