Add generic missed-path coverage reporting

[Marius Storhaug (MariusStorhaug)]

Summary

Adds missed-path reporting to the upstream Process-PSModule coverage flow so consumer repositories do not need repo-local post-coverage jobs.

Changes

• Extended .github/actions/Get-PesterCodeCoverage to generate a generic missed-path report from merged coverage data.
• Added a Missed paths section to the code coverage step summary.
• Emit CodeCoverage-MissedPaths.md and CodeCoverage-MissedPaths.json under CodeCoverage-MissedPaths/.
• Upload CodeCoverage-MissedPaths as an artifact in .github/workflows/Get-CodeCoverage.yml.

Notes

• The implementation intentionally avoids repo-specific heuristics and groups misses by file path and missed line coverage.
• Artifact upload runs with if: always() so the report is still available when coverage threshold enforcement fails.

[github-actions]

Super-linter summary

Language	Validation result
CHECKOV	Pass ✅
GITLEAKS	Pass ✅
GIT_MERGE_CONFLICT_MARKERS	Pass ✅
MARKDOWN	Pass ✅
NATURAL_LANGUAGE	Pass ✅
POWERSHELL	Pass ✅
PRE_COMMIT	Pass ✅
SPELL_CODESPELL	Pass ✅
TRIVY	Pass ✅
YAML	Pass ✅

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