Fix unhandled ERR_IPC_CHANNEL_CLOSED and a deadlock

[xamgore]

The detailed description is at #11143.

Fixes #11143

[codecov-io]

Codecov Report

Merging #11144 (b259724) into master (78af379) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #11144      +/-   ##
==========================================
+ Coverage   64.18%   64.20%   +0.01%     
==========================================
  Files         307      307              
  Lines       13370    13370              
  Branches     3262     3262              
==========================================
+ Hits         8582     8584       +2     
+ Misses       4083     4082       -1     
+ Partials      705      704       -1     

Impacted Files	Coverage Δ
...ages/jest-worker/src/workers/ChildProcessWorker.ts	90.36% <100.00%> (ø)
packages/expect/src/utils.ts	96.12% <0.00%> (+1.29%)	⬆️

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[jeysal]

Suggested change

	private _onExit(exitCode: number) {
	private _onExit(exitCode: number | null) {

[xamgore]

Merged it, thanks!

[SimenB]

changelog entry and Tim's type suggestion and I think we're good to go 🙂

[github-actions]

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