Enable skipped pipelines audit events feature flag

Marcos Rocharequested to merge
mc_rocha-enable-skipped-pipelines-audit-events-ff into master

What does this MR do and why?

This MR enables the collect_security_policy_skipped_pipelines_audit_events feature flag by default. The feature flag is already enabled in GitLab.com.

References

Related to #550772 (closed), #539232 (closed)

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