Collapse lint action into test-all workflow (#55427)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/55427

Following previous diffs, this now promotes the `lint` action to direct job steps.

**Motivation**

This has the advantage of making sub-steps in the GitHub UI visible, rather than running the 7 lint steps under a single banner.

I feel this is justified in the case of `lint`, although increasing the size of `.github/workflowsl/test-all.yml` slightly, because:
- Each step in this job is a distinct tool run with differing output, rather than one logical "action" — and this grouped output is therefore useful to the user.
- Lint failures are reasonably frequent for users, emphasising the above.

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D92417807

fbshipit-source-id: ed24cfa2e581a528e80faec4128d280926f56613