Feat: Remove SeverityLevel from ValidationNotice constructor

[bdferris-v2]

Closes #1472.

Cleans up ValidationNotice(SeverityLevel) constructor calls, as SeverityLevel is now read from the @GtfsValidationNotice annotation.

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[davidgamez]

Hi @bdferris-v2 , can we update the documentation located on NEW_RULES.md part of this PR?

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1430 sources (~0 %) are corrupted.
Commit: 969a050
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[bdferris-v2]

@davidgamez done

[davidgamez]

🚀

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1430 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1430 sources (~0 %) are corrupted.
Commit: bf561f9
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.