<C-u> to clear watch mode pattern prompt

[madhur1846]

Summary

Many users will expect Ctrl+u to behave as elsewhere in their terminal environment.
The workaround requires pressing backspace a lot to clear the line manually.

[codecov-commenter]

Codecov Report

Merging #11347 (7b999c8) into master (b3f9e4a) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #11347      +/-   ##
==========================================
- Coverage   64.24%   64.24%   -0.01%     
==========================================
  Files         308      308              
  Lines       13502    13507       +5     
  Branches     3289     3289              
==========================================
+ Hits         8675     8677       +2     
- Misses       4117     4121       +4     
+ Partials      710      709       -1     

Impacted Files	Coverage Δ
packages/jest-watcher/src/constants.ts	66.66% <ø> (ø)
packages/jest-watcher/src/lib/Prompt.ts	66.66% <0.00%> (-6.81%)	⬇️
packages/expect/src/utils.ts	96.12% <0.00%> (+1.29%)	⬆️

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[SimenB]

#11345 (comment)

[github-actions]

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