build(snap): Upgrade snap base to core22, remove deprecated plug

[MonicaisHer]

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PR Checklist

Please check if your PR fulfills the following requirements:

• [x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• [x] I am not introducing a new dependency (add notes below if you are)
• [ ] I have added unit tests for the new feature or bug fix (if not, why?)
• [x] I have fully tested (add details below) this the new feature or bug fix (if not, why?)
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Testing Instructions

Successfully passed the edgex-snap-testing suite locally.

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #323 (02059e7) into main (9cf6c29) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #323   +/-   ##
=======================================
  Coverage   33.38%   33.38%           
=======================================
  Files          18       18           
  Lines        1800     1800           
=======================================
  Hits          601      601           
  Misses       1133     1133           
  Partials       66       66           

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