Add a trailing slash to the root pattern

[mjesun]

When verifying if a test belongs to a particular project, the root of the project is part of the checks we perform (roots is checked against the filename via a regular expression). However, the regular expression did not include a trailing slash (either / or \ for Windows), which causes to wrongly recognize tests as part of a pattern. For instance:

• Root A: /foo/bar/folder.
• Root B: /foo/bar/folder-with-something.

All tests inside B are executed also through config A, since B starts with A. This leads to tests getting executed twice if not crashing. Adding a trailing slash fixes the problem.

[codecov-io]

Codecov Report

Merging #5464 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5464      +/-   ##
==========================================
+ Coverage   62.19%   62.22%   +0.02%     
==========================================
  Files         205      205              
  Lines        6930     6930              
  Branches        3        3              
==========================================
+ Hits         4310     4312       +2     
+ Misses       2619     2617       -2     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-cli/src/search_source.js	40% <100%> (+2.35%)	⬆️

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[SimenB]

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[github-actions]

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