Filter out test rules in RuleSelector JSON schema

[MichaReiser]

Summary

Running cargo test fails today because cargo dev generate-all runs with the test-rules feature enabled (because ruff enables the feature), which results in the test rules showing up in the JSON schema.

This PR fixes this by filtering out the test rules if the test-rules feature is enabled. I don't particularly like it but how it is today is very disruptive to the development workflow.

Test Plan

cargo test no longer fails

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

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Formatter (stable)

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Formatter (preview)

✅ ecosystem check detected no format changes.

[zanieb]

okeee thanks for cleaning up after me