Update E402 to work at cell level for notebooks

[dhruvmanila]

Summary

This PR updates the E402 rule to work at cell level for Jupyter notebooks. This is enabled only in preview to gather feedback.

The implementation basically resets the import boundary flag on the semantic model when we encounter the first statement in a cell.

Another potential solution is to introduce E403 rule that is specifically for notebooks that works at cell level while E402 will be disabled for notebooks.

Test Plan

Add a notebook with imports in multiple cells and verify that the rule works as expected.

resolves: #8669

[dhruvmanila]

Current dependencies on/for this PR:

• main
  • PR Update E402 to work at cell level for notebooks #8872 👈

This stack of pull requests is managed by Graphite.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.