Enable `Lint/AmbiguousOperator` and `Lint/AmbiguousRegexpLiteral` cops
Enable `Lint/AmbiguousOperator` and `Lint/AmbiguousRegexpLiteral` cops

To avoid newly adding the warnings, which are frequently addressed.

ac721c855203ac7570545c0e85fe086f8e94d94a
951383bd9afa4a71c17e56d1d4eb5866da851483
8a0f235fd3bd3f3c813fa7034c6d741831e55c3e

c33c03e80cbe9f27274b45fe55f93bad3af988fb
424b2019830ea4c08e86ba9ff9600aa23a54cb4f

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