feat: remove SockJS support

[bjohansebas]

Summary

This removes SockJS, which was used to maintain compatibility with older browsers, but is no longer necessary
What kind of change does this PR introduce?

Did you add tests for your changes?

yes

Does this PR introduce a breaking change?

yes

If relevant, what needs to be documented once your changes are merged or what have you already documented?

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.57%. Comparing base (09bdda5) to head (ca0d307).
⚠️ Report is 2 commits behind head on next.

Files with missing lines	Patch %	Lines
lib/Server.js	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #5626   +/-   ##
=======================================
  Coverage   83.56%   83.57%           
=======================================
  Files          13       11    -2     
  Lines        2050     1966   -84     
  Branches      755      736   -19     
=======================================
- Hits         1713     1643   -70     
+ Misses        303      290   -13     
+ Partials       34       33    -1     

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[alexander-akait]

@bjohansebas If you will need a help feel free to ping me

[bjohansebas]

I don’t understand why macOS and Windows are failing.

[alexander-akait]

@bjohansebas Looks like racing in tests... macos works fine, windows doesn't, do I need to look deeply?

[bjohansebas]

@bjohansebas Looks like racing in tests... macos works fine, windows doesn't, do I need to look deeply?

yes, please!

[bjohansebas]

Hmm, it’s still happening even after updating Puppeteer. I’m still investigating.

[alexander-akait]

@bjohansebas I think it is just unstable test maybe we need to rewrite this test

[bjohansebas]

Okay, I did it, i got it working. Ready for review.

[alexander-akait]

Feel free to merge