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Replace sidekiq process mtail metrics with direct instrumentation

Similar to https://gitlab.com/gitlab-org/gitlab-ce/issues/56752, we need additional metrics that we currently only get from mtail

  • Process metrics
    • process_start_time_seconds for the sidekiq/cluster master.
    • process_cpu_seconds_total for the master and any workers.
    • process_resident_memory_bytes for the master and any workers.