Cleanup use_prevent_all_for_job_token_scope feature flag

Ian Andersonrequested to merge
595240-cleanup-use_prevent_all_for_job_token_scope into master

What does this MR do and why?

Cleanup use_prevent_all_for_job_token_scope feature flag

This feature has been fully rolled out in production and is working as expected.

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Related to #595240 (closed)

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