Remove Ci::CancelPipelineWorker

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Problem

After the implementation of #390453, we will not need to cancel the child pipelines with force_execute since we can pass the pipeline triggering user and do a permission check even for child pipelines. The only other example left using force_execute will be from CancelRedundantPipelinesService which doesn't currently user a separate worker for each pipeline.

Proposals

1. Remove the Ci::CancelPipelineWorker across two releases as documented (note: step 1 can be done as part of #390453).