[projmgr] Update list examples command

[grasci-arm]

Address feedback #2140 (comment)

• do not print components, categories, keywords
• search for --filter only among example names. Do not add further command line options to avoid asymmetry with other list commands. In RPC methods board, device and environment will be input parameters and the results will be filtered accordingly.
• handle --verbose flag
• print "Reference Application:" before such examples (hardware agnostic examples)
• filter out "Reference Applications" for boards that do not have clayer with type Board

[github-actions]

Test Results

    3 files     21 suites   12m 30s ⏱️
  408 tests   408 ✅ 0 💤 0 ❌
1 224 runs  1 224 ✅ 0 💤 0 ❌

Results for commit 81768ae.

[codecov]

Codecov Report

Attention: Patch coverage is 65.38462% with 18 lines in your changes missing coverage. Please review.

Project coverage is 66.58%. Comparing base (bdd4786) to head (81768ae).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/src/ProjMgrWorker.cpp	60.00%	6 Missing and 6 partials ⚠️
tools/projmgr/test/src/ProjMgrUnitTests.cpp	72.72%	0 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2157      +/-   ##
==========================================
- Coverage   66.60%   66.58%   -0.02%     
==========================================
  Files         181      181              
  Lines       37817    37823       +6     
  Branches    22055    22052       -3     
==========================================
- Hits        25187    25186       -1     
- Misses       8055     8060       +5     
- Partials     4575     4577       +2     

Flag	Coverage Δ
projmgr-cov	81.28% <65.38%> (-0.04%)	⬇️

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

Files with missing lines	Coverage Δ
tools/projmgr/include/ProjMgrWorker.h	77.27% <ø> (ø)
tools/projmgr/test/src/ProjMgrUnitTests.cpp	80.41% <72.72%> (+<0.01%)	⬆️
tools/projmgr/src/ProjMgrWorker.cpp	87.80% <60.00%> (-0.16%)	⬇️

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