Suppress SimpleCov intermediate coverage result messages #13963

Job	Run time
Rubygems under a ruby-core / master	5m 49s
Bundler under a ruby-core / master	18m 37s
Rubygems under a ruby-core / ruby_4_0	5m 51s
Rubygems under a ruby-core / ruby_3_4	5m 49s
Bundler under a ruby-core / ruby_4_0	19m 47s
Bundler under a ruby-core / ruby_3_4	20m 28s
All ruby-core jobs pass	4s
	1h 16m 25s

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