Refactor servers

[alexander-akait]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

I will remove --forceExit from jest CLI, because we have bug so we have this stuff

Motivation / Use-Case

fix closing web socket server

Breaking Changes

No

Additional Info

no

[codecov]

Codecov Report

Merging #3446 (50cba19) into master (003c927) will increase coverage by 7.38%.
The diff coverage is 95.05%.

@@            Coverage Diff             @@
##           master    #3446      +/-   ##
==========================================
+ Coverage   87.45%   94.84%   +7.38%     
==========================================
  Files           9       34      +25     
  Lines         598     1358     +760     
  Branches      180      401     +221     
==========================================
+ Hits          523     1288     +765     
- Misses         63       65       +2     
+ Partials       12        5       -7     

Impacted Files	Coverage Δ
lib/utils/findCacheDir.js	61.90% <61.90%> (ø)
client-src/utils/sendMessage.js	85.71% <85.71%> (ø)
client-src/utils/reloadApp.js	86.95% <86.95%> (ø)
lib/utils/getCertificate.js	88.46% <88.46%> (ø)
lib/utils/getSocketServerImplementation.js	90.47% <90.47%> (ø)
lib/servers/SockJSServer.js	90.69% <90.69%> (ø)
lib/utils/setupExitSignals.js	90.90% <90.90%> (ø)
client-src/index.js	91.07% <91.07%> (ø)
lib/servers/WebsocketServer.js	94.73% <94.73%> (ø)
lib/Server.js	95.02% <95.59%> (+11.57%)	⬆️
... and 55 more

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[alexander-akait]

@snitin315 @anshumanv this PR should fix tests and reduce freezing our tests, sometimes jest do not throw an error in our tests, WIP on this too, and then we will update just and return to stale PRs

[alexander-akait]

Still rare freeze, let's fix them here #3448