Fixes fetching branch option

Andy Schoenenrequested to merge
andyschoenen/fix-scheduled-pipeline-execution-policy-branches-option into master

What does this MR do and why?

In !196660 (merged) we changed the branch option for Security::PipelineExecutionPolicies::RunScheduleWorker from symbol to string. This MR makes the worker use a string to fetch branch from the options parameter.

References

Related work item: #547932 (closed)

How to set up and validate locally

Follow the verification steps from #547932 (comment 2589568857)

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