Updates GQL mutation for job actions

What does this MR do and why?

Updates the GraphQL Mutation id for job retry actions to be Ci::Processable rather than Ci::Build, to accommodate both Ci::Bridge and Ci::Build

This is an MR that is part of a series of backend issues needed for this epic: &6947 (closed)

MR	Status
Renames service to RetryJobService, as well as other refactoring	✅
Add ability to retry a Ci::Bridge	✅
Update GraphQL Mutation to use service	👈
Follow-up - use EventStore in run_after_commit_block	In Progress

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