test: track test coverage for all integrations

[anakin87]

Related Issues

• part of https://github.com/deepset-ai/haystack-private/issues/275

Proposed Changes:

• replicate test: start tracking test coverage #3061 for all integrations

How did you test it?

CI

Some test failures (meta-llama) are unrelated

Notes for the reviewer

• I noticed that some integrations don't have tests marked as integration, so for them, I am skipping integration tests, otherwise pytest-cov fails. In future PRs, I'll add the marker if it's erroneously missing and add the integration tests steps to the workflow.
• Don't get scared by the many coverage comments on this PR: for standard PRs targeting one integration, the comment will be on and updated every time (see for example try coverage comments #3069 (comment))

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

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[davidsbatista]

looks good