fix: get relative path in haste map

[yamatatsu]

Summary

close #7323

ex)
dirname: foo/bar
filename: foo/barbaz/index.js

And relative() return az/index.js.

Expected return ../barbaz/index.js

Test plan

Added a test with fix commit.

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[SimenB]

Could you update the changelog? :)

[rubennorte]

Looks good. Please add the changelog entry and it's good to merge :)

[yamatatsu]

Thank you for replying!
I've writen it !!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[codecov-io]

Codecov Report

Merging #7324 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #7324   +/-   ##
=======================================
  Coverage   66.64%   66.64%           
=======================================
  Files         241      241           
  Lines        9345     9345           
  Branches        5        6    +1     
=======================================
  Hits         6228     6228           
  Misses       3114     3114           
  Partials        3        3

Impacted Files	Coverage Δ
packages/jest-haste-map/src/lib/fast_path.js	100% <100%> (ø)	⬆️

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