First pass at CI and release process improvements

[jhodges10]

Link the Issue(s) this Pull Request is related to.

• Closes Improve CI and release process #1690
• Related to Add Test pass for build artifacts #1027
• Will eventually also fix Add Apple Silicon/ARM wheels #1672

Summarize your change.

• Introduce automated PR labels based on what directory code changes happen in
• Rename the publish GitHub Action task to PyPI Publish
• Utilize PR labels to group changes into sections on the release notes preview
• Send Slack notifications when a release preview is generated, and when a release is ultimately published

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jhodges10 / name: Jeff (1de0a98, c1168e4, 5379cb1, e199f78, 8ea805f, 7d8dcb8, d145e90, 5fe5821, 184e8a0, 5fe00f7, 15d8f02, d62d6ce)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (745e614) 79.84% compared to head (6ddabd2) 79.84%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1689   +/-   ##
=======================================
  Coverage   79.84%   79.84%           
=======================================
  Files         197      197           
  Lines       21767    21792   +25     
  Branches     4354     4358    +4     
=======================================
+ Hits        17379    17399   +20     
+ Misses       2234     2232    -2     
- Partials     2154     2161    +7     

Flag	Coverage Δ
py-unittests	79.84% <ø> (+<0.01%)	⬆️

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see 11 files with indirect coverage changes

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[meshula]

I'm the sort of person to spell colour with a u ;) ~~~ other than I don't get the "feat" trend so I object to using it instead of "feature" on principle, this all looks fine to me.

[reinecke]

Great step forward!