Fix `RSpec/SortMetadata` cop to sort only trailing metadata #2443

Job	Run time
Confirm config and documentation	12s
Test coverage	19s
Oldest RuboCop: spec	18s
Edge RuboCop: internal_investigation	14s
Edge RuboCop: spec	19s
Ruby 2.7: internal_investigation	24s
Prism	36s
Ruby 2.7: spec	34s
RSpec 4	23s
Ruby 3.0: internal_investigation	12s
Ruby 3.0: spec	18s
Ruby 3.1: internal_investigation	12s
Ruby 3.1: spec	19s
Ruby 3.2: internal_investigation	12s
Ruby 3.2: spec	19s
Ruby 3.3: internal_investigation	11s
Ruby 3.3: spec	18s
Ruby 3.4: internal_investigation	11s
Ruby 3.4: spec	21s
Ruby ruby-head: internal_investigation	12s
Ruby ruby-head: spec	17s
Ruby jruby-9.4: internal_investigation	1m 25s
Ruby jruby-9.4: spec	1m 23s
	9m 9s

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