feat(alerting): Update Adaptive Cards design for teams-workflows

[Tim-orius]

Summary

I've updated the design of the adaptive card for msteams as follows:

• Stretch card to entire width
• Add a colored border signaling success or error

New Design examples:

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.49%. Comparing base (0113175) to head (e83516a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #903      +/-   ##
==========================================
+ Coverage   77.42%   77.49%   +0.07%     
==========================================
  Files          72       72              
  Lines        5784     5802      +18     
==========================================
+ Hits         4478     4496      +18     
  Misses       1089     1089              
  Partials      217      217              

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[TwiN]

Looks awesome!