Security Full Data Set – Backend (1) – Remove `MAX_FINDINGS_COUNT` cap and introduce feature flag

What does this MR do and why?

We introduce the security_mr_report_full_finding_set feature flag. When the flag is enabled, we should no longer use the 25-finding cap in SecurityFindingsReportsComparer.

The reason we want to do this so added and fixed return the complete undismissed finding set per report type, instead of only 25.

References

• This MR closes: #597438 (closed)
• Backend Parent issue: #596809
• Main parent issue: gitlab-org#20760
• Main Project epic: gitlab-org#18313
• Feature flag roll out issue: #597608

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