503371 / Rename Tool Header to Report Type on Group Level

What does this MR do and why?

We are adding the vulnerability_report_type_scanner_filter feature flag at the Group level to rename the Tool filter to Report Type header column on th Vulnerability Report dashboard. This change follows the same implementation we previously completed at the Project level (!178195 (merged)).

References

• Related issue: #515993 (closed)
• Main parent issue: #503371 (closed)

MR acceptance checklist

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Before	After

How to set up and validate locally

1. Check out the corresponding branch. Enable the vulnerability_report_type_scanner_filter in your rails console, by running Feature.enable(:vulnerability_report_type_scanner_filter)
2. Go to a the Vulnerability Page of a group, e.g. http://gdk.test:3000/groups/gitlab-org/-/security/vulnerabilities. The second to last column should be changed from Tool to Report Type.