Replace after_script with usage of LM_REPORT_FILE

What does this MR do?

This change replaces the after_script hook that moves the old file name to the new file name with a variable that can specify the desired report file name.

We need this change to support new naming (license_scanning) for License Compliance.

This is a temporal fix until we update the License Compliance analyzer to generate gl-license-scanning-report.json by default. #213577 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team