Remove deprecated and unused service
What does this MR do and why?
This MR removes a deprecated and unused service. See Track Clusters::Applications service code removal (#384341 - closed) and Remove clusters_applications_* code (#366573 - closed) for more information
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.