feat: Remove unit-test that RULES.md is up-to-date with Notice classes.

[bdferris-v2]

Per #1515, we have moved away from RULES.md as the canonical source of notice documentation. As part of this deprecation, this PR removes the unit-test that checks that RULES.md has an entry for every notice class.

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[davidgamez]

Should we, as part of this PR, rewrite RULES.MD pointing to the web-validator documentation(https://gtfs-validator.mobilitydata.org/rules.html) and removing all the rules information? It can be done as a quick follow-up too.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1435 sources (~0 %) are corrupted.
Commit: 0ce4cb8
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[bdferris-v2]

@davidgamez I've updated RULES.md per your suggestion.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1435 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1435 sources (~0 %) are corrupted.
Commit: fec2d10
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[davidgamez]

LGTM!