Extracted from#9558

if provisioner daemons are out of date with the server version, unexpected behavior can occur. the health check endpoint/api/v2/debug/health should display configured, provisioners, and their versions.

TODOs:

• feat: purge old provisioner daemons #10949 Prune inactive provisioner daemons from database.
• feat(coderd): add last_seen_at and version to provisioner_daemons table #11033 Addprovisioner_daemon.version to database.
• feat(cli): allow specifying name of provisioner daemon #11077 Stabilize provisioner name generation (no moregallant_galois0).
• feat(coderd/database): add UpsertProvisionerDaemons query #11178 Add support for upserting provisioner daemons
• Populateprovisionerdaemonsfeat(coderd): insert provisioner daemons #11207
• Add "heartbeat" to connected provisioner daemonsfeat(coderd): insert provisioner daemons #11207
• Addmajor.minor version check of active provisioner daemons.feat(coderd): add provisioner_daemons to /debug/health endpoint #11393,fix(coderd/healthcheck): add daemon-specific warnings to healthcheck output #11490
• Build the health check section for provisioner daemons.feat(site): add healthcheck page for provisioner daemons #11494