Draft: Cleanup and replace sidekiq rules

This MR has been split up in 5 MRs:

• Remove useless Sidekiq related dashboards (!6089 - merged)
• Add queue as significant label in Sidekiq SLIs (!6090 - merged)
• Clean up per-worker Sidekiq recording rules (!6091 - merged)
• Redirect Sidekiq job latencies to Kibana links (!6092 - merged)
• Remove usage of Sidekiq histogram metrics in me... (!6096 - merged)

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This MR aims to clean up:

• Sidekiq per-worker recording rules in metrics-catalog/services/lib/sidekiq-per-worker-recording-rules.libsonnet, i.e. those with gitlab_background_jobs:*
• Replace the intermediate rules in https://gitlab.com/gitlab-com/runbooks/-/blob/495f7edd799917bcfe7db4f85a29039036d1acf4/metrics-catalog/services/sidekiq.jsonnet#L65-66, i.e. references to sli_aggregations:sidekiq_jobs_completion_seconds_bucket and sli_aggregations:sidekiq_jobs_queue_duration_seconds_bucket. Panels with queueing & execution latency will be directed to Kibana visualization instead (which is much more accurate but only having 7 days retention period).

Part of the cleanup in rollout plan gitlab-com/gl-infra/scalability#2415 (closed)

More context: https://gitlab.com/gitlab-com/runbooks/-/blob/master/docs/sidekiq/sidekiq-slis.md

To test the dashboards:

❯ ./test-dashboard.sh sidekiq/worker-detail.dashboard.jsonnet
Installed https://dashboards.gitlab.net/dashboard/snapshot/eQDhUmfs7WvFX7iZTVpmfwdEElzTx1QP - sidekiq: Worker Detail
❯ ./test-dashboard.sh sidekiq/queue-detail.dashboard.jsonnet
Installed https://dashboards.gitlab.net/dashboard/snapshot/X2VPGBIZzmlEIIxS7hWb53coTDPpzfbd - sidekiq: Queue Detail
❯ ./test-dashboard.sh sidekiq/shard-detail.dashboard.jsonnet
Installed https://dashboards.gitlab.net/dashboard/snapshot/kpAJ7Nes8DPXlT4wVU7YupCgKv1SryhV - sidekiq: Shard Detail