test: upload individual test results to codecov to gather stats

[zimeg]

Summary

This PR adds junit reports of test coverage for neat reporting details by @codecov 🤖 ✨

For better insights into #2138 and #2159 patterns!

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (f3cef62) to head (11335c0).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2178   +/-   ##
=======================================
  Coverage   91.94%   91.94%           
=======================================
  Files          38       38           
  Lines       10328    10328           
  Branches      652      652           
=======================================
  Hits         9496     9496           
  Misses        820      820           
  Partials       12       12           

Flag	Coverage Δ
cli-hooks	95.23% <ø> (ø)
cli-test	94.76% <ø> (ø)
oauth	77.39% <ø> (ø)
socket-mode	61.82% <ø> (ø)
web-api	96.88% <ø> (ø)
webhook	96.65% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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[zimeg]

🔗 Here're the test results of this PR on the @codecov site!

[zimeg]

📝 Wow! I'm going to rerun the failing test, but the @codecov comment for a failed test is impressive ✨