Add coverage reports on all test runs

[MathieuLamiot]

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[MathieuLamiot]

@Tabrisrp I noticed the code_coverage action was broken, probably due to new WP latest version. With Q2 OKRs, we'll keep focusing on built-in tests and I am looking into measuring code coverage (mostly diff code coverage, so code coverage only on the modified lines per PR). I think this CI refacto is needed to:

• Get code coverage on unit & integration tests (we only had unit)
• Keep the CI fast: coverage report on all integration tests took >30 min. So here it runs only on the "general" tests
• Get code coverage for more PRs, not only the ones to develop.

Let me know what you think

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 5b2f58a1	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (5b2f58a)	Report Missing	Report Missing	Report Missing
Head commit (6e3af9e)	35929	8356	23.26%

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 (#6558)	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%

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_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}

Footnotes

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. ↩