ci: Replace local RL scanner with reusable action

[kailash-b]

Changes

Migrates the ReversingLabs (RL) malware scan from this repo's local composite action to the shared, maintained reusable action in auth0/devsecops-tooling, so all Auth0 SDKs use one common scanner.

• .github/workflows/rl-secure.yml: The "Run RL Scanner" step now uses auth0/devsecops-tooling/.github/actions/rl-scan@main instead of the local ./.github/actions/rl-scanner. Two new required secrets were added to the workflow_call definition: SIGNAL_HANDLER_DOMAIN and PRODSEC_PYTHON_TOOLS_REPO.
• .github/workflows/release.yml: Wired the two new secrets (SIGNAL_HANDLER_DOMAIN, PRODSEC_PYTHON_TOOLS_REPO) into all three rl-scanner-* job calls.
• .github/actions/rl-scanner/action.yml: Deleted - the shared reusable action fully replaces it, and there are no remaining references in the repo.

References

Testing

This is a CI/workflow-only change with no library code impact. It can only be fully validated by triggering the release workflow (workflow_dispatch or a merged release/* PR) and confirming the RL scan job runs and passes against the shared action.

• This change adds unit test coverage - N/A (CI workflow change)
• This change adds integration test coverage - N/A (CI workflow change)
• This change has been tested on the latest version of the platform/language or why not - to be verified via the release workflow run

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.13%. Comparing base (524191f) to head (cbd89b2).

❗ There is a different number of reports uploaded between BASE (524191f) and HEAD (cbd89b2). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (524191f)	HEAD (cbd89b2)
mgmtIntTests	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1028       +/-   ##
===========================================
- Coverage   31.94%    3.13%   -28.82%     
===========================================
  Files        2788     2788               
  Lines      110955   110955               
  Branches     6506     6506               
===========================================
- Hits        35449     3476    -31973     
- Misses      73640   107360    +33720     
+ Partials     1866      119     -1747     

Flag	Coverage Δ
authIntTests	2.96% <ø> (ø)
mgmtIntTests	?
unittests	0.30% <ø> (ø)

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