Revert "chore: new github action to run security-guardian"

[moelasmar]

Reverts #34115

See this execution https://github.com/aws/aws-cdk/actions/runs/14462048596/job/40556307500?pr=33820 ... Although it contains template.json, but it failed finding it.

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ The title prefix of this pull request must be one of "feat|fix|build|chore|ci|docs|style|refactor|perf|test|revert"

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.00%. Comparing base (beb42fd) to head (38abfb2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #34147   +/-   ##
=======================================
  Coverage   84.00%   84.00%           
=======================================
  Files         121      121           
  Lines        6984     6984           
  Branches     1179     1179           
=======================================
  Hits         5867     5867           
  Misses       1005     1005           
  Partials      112      112           

Flag	Coverage Δ
suite.unit	84.00% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	84.00% <ø> (ø)

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 38abfb2
• Result: SUCCEEDED
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