gitleaks result output path

Hello,

Is there a way to override the file name with the scan results, similar to the `--report-path` flag in gitleaks? Now the results are always output to the file `results.sarif`.

If not, is it possible to add this feature?

Start by tracing how the action currently writes scan results to results.sarif and compare that behavior with gitleaks' --report-path option. Done means the output filename can be overridden while results.sarif remains the default.

Written by the indexing model from the issue text.