[projmgr] Add component maxInstances to cbuild.yml

[grasci-arm]

Address #2156

[github-actions]

Test Results

    3 files     21 suites   12m 24s ⏱️
  409 tests   409 ✅ 0 💤 0 ❌
1 227 runs  1 227 ✅ 0 💤 0 ❌

Results for commit 0c600a1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.59%. Comparing base (ac3765b) to head (0c600a1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2159   +/-   ##
=======================================
  Coverage   66.59%   66.59%           
=======================================
  Files         181      181           
  Lines       37865    37867    +2     
  Branches    22077    22079    +2     
=======================================
+ Hits        25217    25219    +2     
  Misses       8061     8061           
  Partials     4587     4587           

Flag	Coverage Δ
projmgr-cov	81.26% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrCbuild.cpp	93.70% <100.00%> (+0.02%)	⬆️

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