Update License Compliance analyzer to generate `gl-license-scanning-report` file

Follow-up from #8912 (closed)

Right now License Compliance analyzer generates a gl-license-management-report.json file. And in CI template we are renaming it to license_scanning

We need to update the analyzer to generate gl-license-scanning-report.json file since we're dropping support for license_management.

Implementation plan

1. In analyzer, change default name for generated report to gl-license-scanning-report.json
2. In License-Scanning.gitlab-ci.yml remove line LM_REPORT_FILE: gl-license-scanning-report.json

Testing

As part of the license compliance end to end test, as tracked at #219461 (closed), this should be tested with the default name