feat: support correcting `assert_nil` and `refute_nil` to `RSpec/Rails/MinitestAssertions` #1789

Job	Run time
Confirm config and documentation	13s
Test coverage	28s
Edge RuboCop: internal_investigation	14s
RSpec 4	22s
Edge RuboCop: spec	19s
Ruby 2.7: internal_investigation	30s
Ruby 2.7: spec	31s
Ruby 3.0: internal_investigation	12s
Ruby 3.0: spec	19s
Ruby 3.1: internal_investigation	12s
Ruby 3.1: spec	20s
Ruby 3.2: internal_investigation	15s
Ruby 3.2: spec	18s
Ruby 3.3: internal_investigation	12s
Ruby 3.3: spec	22s
Ruby ruby-head: internal_investigation	12s
Ruby ruby-head: spec	24s
Ruby jruby-9.4: internal_investigation	1m 19s
Ruby jruby-9.4: spec	1m 23s
	8m 5s

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