Remove populate_organization_id_in_runner_tables feature flag

MR	Description
1. !193171 (merged)	Add organization_id column to runner tables
2. !193202 (merged)	Populate organization_id in runner tables
3. !194119 (merged) 👈	Remove the populate_organization_id_in_runner_tables FF
4. !193195 (merged)	Backfill organization_id column in runner tables

What does this MR do and why?

This MR removes the FF introduced in the !193202 (merged). Once we know that the code is working as expected in .com, we'll merge this MR and unblock the already approved !193195 (merged) so that we can start populating the column in production.

References

• Add organization_id column to runner tables (#523694 - closed)
• Populate organization_id in runner tables (!193202 - merged)

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