[Observability] New platform migration

[jasonrhodes]

This issue tracks work we are doing to migrate observability plugins to the new platform.

Shared o11y

• Shared context provider for shared access to Kibana core: [APM] Sets up APM with new shared Kibana core context #43920 (Note: this work overlaps with a kibana-react shared context provider but until we are sure that API is stable and works for us, we moved forward with our own shared version so we can migrate all of us to the kibana-react one more easily when that makes sense)
• BLOCKER for all: ui/autocomplete_providers NP shim Shim ui/autocomplete_providers into legacy data plugin #44949

APM

• Initial shim: [APM] Shim new platform #34531
• Replacing "injectedVars" with NP shim: [APM] New platform migration: replace injected vars #44232
• Replacing kfetch with core.http: [APM] NP migration replace ui/kfetch with core.http #46548
• Replace kuery bar with observability-wide component
• Replacing ui/notify with core.notification [APM] New platform migration update toast notifications #46550

Uptime

• Uptime client shim: [Uptime][Meta] Migrate uptime to new platform #41845
• Uptime server shim: [Uptime] Shim server for new platform #44938

Infra/Logs

• Initial client-side shim: [Infra + Logs UI] New platform client shim #39080
• Initial server-side shim: Infra server NP shim + config/routing API adoption #45299
• NP-related cleanup: [Infra and Logs UI] Clean up new platform start up #43871

Integrations Manager

This plugin was built in the new platform, mainly, so it should have very little to "migrate".

• TBD