OPS-157454: Upload test coverage to Codacy from CI

[davidnmbond]

What

Adds a coverage job to the CI workflow. It builds the test project, runs the Microsoft.Testing.Platform test executable with Microsoft.Testing.Extensions.CodeCoverage (--coverage --coverage-output-format cobertura), uploads the Cobertura report to Codacy with codacy/codacy-coverage-reporter-action (continue-on-error: true, so a Codacy outage cannot turn a green run red), and keeps the report as a 7-day artifact. It runs on pdl-public, never a GitHub-hosted runner. A coverage.config matching the estate's reference (PanoramicData.NugetManagement) excludes test assemblies and generated code.

Which tests run in CI

Only tests that need no credentials. The estate's xunit.runner.json sets failSkips: true, so an unconfigured test would fail rather than skip. Tests that need live credentials or a live service are tagged [Trait("Category", "Integration")] and CI filters with Category!=Integration. No test was deleted and no assertion changed.

Excluded: nothing; all 92 tests run offline, so no filter is applied.

Local line coverage (CI filter, clean Linux container with no user secrets): 60.4%

Other changes

Also sets UseMicrosoftTestingPlatformRunner in the test project, without which the xunit v3 test executable rejects --coverage. The figure includes the Demo assembly (18.0%); the library itself is at 89.9%.

Tracked on OPS-157454.

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Coverage ∅ diff coverage

Metric	Results
Coverage variation	Report missing for 4b496b51
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4b496b5)	Report Missing	Report Missing	Report Missing
Head commit (be5723e)	3327	2009	60.38%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#71)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

¹ Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct.

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_{TIP This summary will be updated as you push new changes.}