BUG: codestyle checks should not be skipped with `[ci skip]`

I'm not yet sure how to make sure we trigger the codestyle checks even when `[ci skip]` is present, thus GHA is skipped running. But we really should not skip those CIs as even docs changes could trigger failures later, e.g. see https://github.com/astropy/astroquery/pull/3239

Start by inspecting the GitHub Actions workflow definitions that handle codestyle checks and compare their behavior with the [ci skip] case. Review astroquery#3239 for the documented failure scenario. Done means codestyle checks still run when [ci skip] is present, while the intended skip behavior remains intact.

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