Remove the legacy_open_source_license_worker feature flag
What does this MR do and why?
Remove the FF as the worker is stable.
How to set up and validate locally
Follow the steps here !93435 (merged). Updating the FF is no longer required.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #369205 (closed)