[projmgr] Fix yml comparison to avoid rewriting files

[grasci-arm]

Address #2169

[github-actions]

Test Results

    3 files     21 suites   12m 57s ⏱️
  418 tests   418 ✅ 0 💤 0 ❌
1 254 runs  1 254 ✅ 0 💤 0 ❌

Results for commit 742ff76.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.59%. Comparing base (f982336) to head (742ff76).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2170   +/-   ##
=======================================
  Coverage   66.59%   66.59%           
=======================================
  Files         181      181           
  Lines       38384    38385    +1     
  Branches    22492    22493    +1     
=======================================
+ Hits        25562    25563    +1     
  Misses       8079     8079           
  Partials     4743     4743           

Flag	Coverage Δ
projmgr-cov	80.79% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrYamlEmitter.cpp	94.31% <100.00%> (+0.06%)	⬆️

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