chore: simplify Haystack Hatch scripts

[anakin87]

Related Issues

• part of Align naming of hatch scripts across our repos #9467

Proposed Changes:

• introduce the Hatch scripts discussed in the original issue and adapt CI workflows
• remove redundant docstring linting workflow
• update ruff pre-commit and configure it to auto-fix if possible
• update the contributing guidelines with the new scripts

How did you test it?

CI; local tests

Notes for the reviewer

I'll open similar PRs in experimental and core-integrations

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: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 15471784251

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 90.419%

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Totals
Change from base Build 15468967841:	0.02%
Covered Lines:	11485
Relevant Lines:	12702

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💛 - Coveralls

[mpangrazzi]

Looks good!