RuboCop: Keep cop rule Naming/RescuedExceptionsVariableName disabled

What does this MR do and why?

This MR disables Naming/RescuedExceptionsVariableName permanently and cleans up its TODOs.

Initially, it re-enabled this 👮 rule but after discussing the inconsistency with other cops we decided not the enabled it and keep it disabled. See !93828 (comment 1050812797).

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Related to #369268 (closed)