fix: Fix typo in TimeframeOverlapNotice class name

[bdferris-v2]

Also adds a unit-test to prevent future typos.

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[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1470 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1470 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1470 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1470 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1470 sources (~0 %) are corrupted.
Commit: 6600821
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[bdferris-v2]

Thanks @jcpitre !