chore(ci): Remove Semgrep GHA Workflow

[eduardoboronat-okta]

Semgrep is Okta's static application security testing tool. It was previously recommended to add Semgrep directly into CI/CD pipelines or workflows. However, the ProdSec team has enhanced the tooling, and Semgrep scanning is now built into the platform via a GitHub Application.

ℹ️ Details

• You'll find all of your PRs are already being scanned by a dedicated Semgrep step. Given this, you no longer need to run Semgrep via a Github Action workflow.
• ⚠️ This PR attempts to help remove it for you. Please review this change carefully to ensure it doesn't impact any other jobs. Any adjustments needed to make this PR pass is the responsibility of the owners of the repository. (You are also welcome to close this PR and remove Semgrep CI separately).

Created by Sourcegraph batch change eduardo.boronat/Remove-Semgrep-GHA-non-EMU.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.00%. Comparing base (5fbe145) to head (8aa7302).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #799   +/-   ##
=======================================
  Coverage   47.00%   47.00%           
=======================================
  Files           4        4           
  Lines         117      117           
  Branches       38       38           
=======================================
  Hits           55       55           
  Misses         60       60           
  Partials        2        2           

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