Removed regula from github actions and codebase

[bigbitbus]

Description

Removing regula from GH actions, since we are adopting tfsec.

Safety checklist

• [ X] This change is backwards compatible and safe to apply by existing users
• [ X] This change will NOT lead to data loss
• [ X] This change will NOT lead to downtime who already has an env/service setup

How has this change been tested, beside unit tests?

Manually

[codecov]

Codecov Report

Merging #837 (76ec0c3) into main (7a537a1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #837   +/-   ##
=======================================
  Coverage   74.06%   74.06%           
=======================================
  Files         119      119           
  Lines        7821     7821           
=======================================
  Hits         5793     5793           
  Misses       2028     2028           

Flag	Coverage Δ
unittests	74.06% <ø> (ø)

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[nsarupr]

@bigbitbus can you remove this as well.
https://github.com/run-x/opta/blob/feature/remove-regula/.circleci/src/jobs/regula-lint.yaml