OPS-157454: Upload test coverage to Codacy from CI

[davidnmbond]

Summary

Adds a coverage job to CI that runs the test suite with Microsoft.Testing.Extensions.CodeCoverage and uploads the Cobertura report to Codacy with codacy/codacy-coverage-reporter-action, modelled on PanoramicData.NugetManagement.

• Runs on the pdl-public self-hosted runner, never a GitHub-hosted one.
• The upload step is continue-on-error: true, so a Codacy outage cannot turn a passing test run red. The report is also kept as a workflow artifact for 7 days.
• Adds coverage.config (generated-code and test-assembly exclusions, matching the rest of the estate) where one was missing.

Excluded tests

CI runs only tests that need no credentials. Every test class deriving from TestWithOutput drives a live LogicMonitor portal with credentials from user secrets; the base class is now tagged [Trait("Category", "Integration")] and the coverage job filters with --filter-not-trait "Category=Integration". 370 portal-free tests run, a superset of the 16 classes the build job lists.
The build job's existing "Portal-free unit tests" step passes xunit-native -class arguments, so the project is not switched to the MTP runner; the coverage job uses dotnet test ... -- --coverage instead. That step is unchanged.

Coverage

Local line coverage from the offline tests, measured in a clean Linux container with no user secrets: 30.2%.

Tracked on OPS-157454.

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity

Metric	Results
Complexity	0

View in Codacy

🟢 Coverage ∅ diff coverage

Metric	Results
Coverage variation	Report missing for 1500ad71
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1500ad7)	Report Missing	Report Missing	Report Missing
Head commit (c89a693)	6161	1861	30.21%

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 (#51)	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.}