Update GHA configurations

[nateprewitt]

This PR adds:

• Explicit pins for GHA modules.
• Explicit scoping for token usage in our existing workflows.
• Adds CodeQL to run static analysis over code base.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1eef558) 85.36% compared to head (68de6e2) 85.36%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #268   +/-   ##
========================================
  Coverage    85.36%   85.36%           
========================================
  Files           16       16           
  Lines         2719     2719           
========================================
  Hits          2321     2321           
  Misses         398      398           

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