Don't print test summary in --silent

[aaronabramov]

this is probably not the best solution. Because of the way we run test with arc in www, summary reporter prints a very long message at the end

ran all tests matching <VERY_LONG_STRING_WITH_ALL_FILES_CHANGED_IN_THIS_DIFF>

[codecov-io]

Codecov Report

Merging #4106 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4106      +/-   ##
==========================================
- Coverage   60.34%   60.32%   -0.02%     
==========================================
  Files         195      195              
  Lines        6755     6757       +2     
  Branches        6        6              
==========================================
  Hits         4076     4076              
- Misses       2676     2678       +2     
  Partials        3        3

Impacted Files	Coverage Δ
...ackages/jest-cli/src/reporters/summary_reporter.js	20.63% <0%> (-0.68%)	⬇️

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[cpojer]

I'm fine with that.

[github-actions]

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