Fix regular expression for matching message for findMessageType

[natealcedo]

Summary

This pull request updates the regular expression that was wrongly written in #7028 where the tests were passing because the tests were written wrongly. The quotation marks were missing in the regular expression.

Test plan

The tests in jest-editor-support/src/__tests__/runner.tests.js have been updated with the the quotation marks in place.

[codecov-io]

Codecov Report

Merging #7029 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #7029   +/-   ##
=======================================
  Coverage   66.95%   66.95%           
=======================================
  Files         250      250           
  Lines       10430    10430           
  Branches        4        4           
=======================================
  Hits         6983     6983           
  Misses       3446     3446           
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-editor-support/src/Runner.js	74.25% <100%> (ø)	⬆️

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[SimenB]

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[github-actions]

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