[projmgr] Refine warning about pack selection

[brondani]

Fixes

• [csolution] Incompatible major pack versions selected concurrently do not cause failure (in line with specification) #2405 (comment)

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

    3 files   -    55     21 suites   - 155   15m 49s ⏱️ - 5m 26s
  461 tests  -   451    461 ✅  -   434  0 💤  - 17  0 ❌ ±0 
1 383 runs   - 1 490  1 383 ✅  - 1 422  0 💤  - 68  0 ❌ ±0 

Results for commit 81fa62a. ± Comparison against base commit d511ad6.

This pull request removes 451 tests.

AuxCmdTests ‑ MkdirCmdTest
AuxCmdTests ‑ RmdirCmdTest
AuxCmdTests ‑ TouchCmdTest
BuildSystemGeneratorTests ‑ GenAuditFile
BuildSystemGeneratorTests ‑ GenAuditFile_WithOut_Existing_Audit_File
BuildSystemGeneratorTests ‑ GenAuditFile_With_Existing_Audit_File
BuildSystemGeneratorTests ‑ GetString
BuildSystemGeneratorTests ‑ StrConv
BuildSystemGeneratorTests ‑ StrNorm
CBuildGCCTests ‑ Asm
…

[jkrech]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.93%. Comparing base (d511ad6) to head (81fa62a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2465   +/-   ##
=======================================
  Coverage   64.93%   64.93%           
=======================================
  Files         145      145           
  Lines       26321    26321           
  Branches    15902    15902           
=======================================
+ Hits        17091    17092    +1     
  Misses       7063     7063           
+ Partials     2167     2166    -1     

Flag	Coverage Δ
projmgr-cov	87.91% <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	87.37% <100.00%> (+0.02%)	⬆️

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