Remove abuse_report_labels Feature Flag

The feature flag: abuse_report_labels

Date of feature flag creation: August 8th 2023

Link to rollout issue: #421373 (closed)

• Risk: High
• Saas: Yes
• Self managed: Maybe? It might work on self managed but we didn't design for it because it was designed for an internal team.
• Current rollout state:

Problem: This feature flag seems to be disabled everywhere but there is still code associated with this feature in the codebase that isn't seem like it's not being used.

Tasks: TBD

Definition of done: Clean up the feature flag and all associated code for the feature that it is guarding.