[jest-docblock] Preserve leading whitespace in docblock comments

[azz]

Follow-up to #4517.

Summary

I noticed the regular expressions used to trim down the docblock were trimming out some useful information: leading whitespace.

/**
 * foo()
 *   .bar()
 */

require('jest-docblock').parseWithComments(...).comments was being producing

foo()
.bar()

This PR preserves all but the first, if present space on each line, such that the output is:

foo()
  .bar()

Test plan

Unit tests added and passing.

[codecov-io]

Codecov Report

Merging #4576 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4576   +/-   ##
=======================================
  Coverage   55.61%   55.61%           
=======================================
  Files         186      186           
  Lines        6354     6354           
  Branches        3        3           
=======================================
  Hits         3534     3534           
  Misses       2819     2819           
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-docblock/src/index.js	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ec87e1f...c0c2ad7. Read the comment docs.

[cpojer]

That works!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.