[projmgr] Clear project setup controls before collecting compiler-specific options

[brondani]

Fixes

• Duplicated wrong relative paths #2603

Changes

• Clear previously collected project setup controls before processing matching setups.
• Add external-generator fixture coverage for AC6 setup-level C misc options with relative paths.

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).

[github-actions]

Test Results

  2 files   14 suites   13m 4s ⏱️
482 tests 482 ✅ 0 💤 0 ❌
964 runs  964 ✅ 0 💤 0 ❌

Results for commit a04bb17.

♻️ This comment has been updated with latest results.

[Copilot]

🟢 Approval recommended

No unresolved review issues were identified.

Pull request overview

Fixes duplicated relative paths by clearing project setup controls before processing compiler-specific setups.

Changes:

• Reset collected setup controls during precedence processing.
• Add AC6 relative misc-option fixture coverage.
• Update generated reference outputs.

File summaries

File	Summary
tools/projmgr/test/data/ExternalGenerator/single/single-core.cproject.yml	Adds an AC6 setup-level relative misc option.
tools/projmgr/test/data/ExternalGenerator/ref/SingleCore/single-core.Debug+CM0.cbuild.yml	Updates expected converted output.
tools/projmgr/test/data/ExternalGenerator/ref/SingleCore/single-core.Debug+CM0.cbuild-gen.yml	Updates expected generator output.
tools/projmgr/test/data/ExternalGenerator/ref/SingleCore/single-core.Debug+Board.cbuild.yml	Updates expected board output.
tools/projmgr/src/ProjMgrWorker.cpp	Clears stale setup controls before collection.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.65%. Comparing base (94cb0c5) to head (a04bb17).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2605   +/-   ##
=======================================
  Coverage   72.65%   72.65%           
=======================================
  Files         185      185           
  Lines       30673    30674    +1     
  Branches    18056    18056           
=======================================
+ Hits        22285    22286    +1     
  Misses       6080     6080           
  Partials     2308     2308           

Flag	Coverage Δ
projmgr-cov	87.97% <100.00%> (+<0.01%)	⬆️

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	87.44% <100.00%> (+<0.01%)	⬆️

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