Duplicate rule B904 and TRY200 are duplicate

[Skylion007]

Rules B904 and TRY200 appear to be looking for the exact same construct (not using from within an exception block), but are separate rules. These should be deduplicated to a common implementation with an alias. We should also probably try to find duplicate rules with an automated mechanism in the future.

[charliermarsh]

Yeah these do look like exact duplicates. We should remove TRY200. Thanks for noticing this.

[Skylion007]

Ah apparently, this itself is a duplicate issue: See #8736