[Fix #49] Add new `Rails/RescueFromExceptionsVariableName` cop #601

Job	Run time
Check documentation syntax	12s
Spec - JRuby	1m 32s
Check the oldest supported RuboCop version	26s
Spec - 2.7	29s
Prism	30s
Spec - 3.0	22s
Spec - 3.1	20s
Spec - 3.2	19s
Spec - 3.3	14s
Spec - 3.4	19s
Spec - head	19s
	5m 2s

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