Use all --testPathPattern and <regexForTestFiles> args in testPathPattern

[seanpoulter]

Summary

This PR changes:

• the type of the --testPathPattern arg to match the multiple allowed values
• the way multiple --testPathPattern args are joined to form a valid regular expression
• the way --testPathPattern args are joined with the default <regexForTestFiles> args

This closes #5037.

Test plan

Tests have been added to check the way the args are joined.
Evaluating the two test cases from #5037 also produce expected patterns:

> jest --testPathPattern=aa --testPathPattern=bb
...
WAS: Pattern: aa,bb
NOW: Pattern: aa|bb

> jest aa --testPathPattern=bb
...
WAS: Pattern: bb
NOW: Pattern: aa|bb

[codecov-io]

Codecov Report

Merging #5066 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5066      +/-   ##
==========================================
- Coverage   60.76%   60.75%   -0.01%     
==========================================
  Files         198      198              
  Lines        6603     6602       -1     
  Branches        4        4              
==========================================
- Hits         4012     4011       -1     
  Misses       2591     2591

Impacted Files	Coverage Δ
packages/jest-config/src/normalize.js	91.95% <ø> (ø)	⬆️
packages/jest-config/src/validate_pattern.js	100% <0%> (ø)	⬆️

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[thymikee]

Nice cleanup!

[cpojer]

Thanks for contributing to Jest <3

[seanpoulter]

Happy to see things move so quickly!

Any suggestions on the next issue? I'm looking at Help Wanted. 😁

[SimenB]

@seanpoulter help with getting open PRs over the line would be great 🙂 As well as hardening the codeframe merged yesterday (I'll create an issue for it)

[github-actions]

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