Unable to validate code scanning workflow

## Summary

When running scans the Security Code Scanner gives the following warning:

Example: https://github.com/MetaMask/metamask-extension/actions/runs/17072938137/job/48406519510#annotation:2:472

> [MetaMask Security Code Scanner](https://github.com/MetaMask/metamask-extension/actions/runs/17072938137/job/48406519510#annotation:2:472)
Unable to validate code scanning workflow: error: getWorkflow() failed: Error: Expected to find a code scanning workflow file at /home/runner/work/metamask-extension/metamask-extension/.github/workflows/security-code-scanner.yml, but no such file existed. This can happen if the currently running workflow checks out a branch that doesn't contain the corresponding workflow file.

Comienza con la ruta referenciada .github/workflows/security-code-scanner.yml y la ejecución vinculada de GitHub Actions para determinar por qué el escáner no puede encontrar el workflow en la rama comprobada. Lee el punto de entrada de validación de workflows de la action y reproduce la advertencia con un workflow representativo; la tarea estará terminada cuando el escáner valide el workflow previsto sin este error.

Escrito por el modelo de indexación a partir del texto del issue.