Fix unit test result publishing in PR pipeline

[mikaelweave]

Summary

• add TRX generation (--report-trx) to the unit test coverage step in build/jobs/build.yml
• disable built-in DotNetCoreCLI test result publishing for that step (publishTestResults: false)
• add explicit PublishTestResults@2 with succeededOrFailed() against $(Agent.TempDirectory)/coverage/**/*.trx

Why

• in build 49903, unit test failures were not reliably surfacing in the Azure DevOps Tests tab when the coverage test step failed
• this aligns unit coverage behavior with the existing explicit publish pattern already used by integration/e2e jobs

Tracking

• AB#195756

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.90%. Comparing base (abca618) to head (52ee55d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5618   +/-   ##
=======================================
  Coverage   76.90%   76.90%           
=======================================
  Files         997      997           
  Lines       36616    36616           
  Branches     5529     5529           
=======================================
  Hits        28160    28160           
+ Misses       7104     7102    -2     
- Partials     1352     1354    +2     

see 6 files with indirect coverage changes

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[mikaelweave]

/arp run