LUKS escrow trigger API

[mostlikelee]

• [x] Add validation: CapabilityLinuxKeyEscrow to https://github.com/fleetdm/fleet/blob/23586-agent-escrow/server/fleet/capabilities.go#L93-L94
• [x] new endpoint to trigger the linux key escrow sequence
  • [x] token auth
  • [x] validate host requirements
  • [x] supported linux variants
  • [x] orbit version
  • [x] set host_disk_encryption_key.reset_requested = 1
• [x] update /orbit/config
  • [x] set LinuxkeyEscrow notification
  • [x] set host_disk_encryption_key.reset_requested = 0 on success (only send 1x)
• [ ] Tests

[jacobshandling]

Adding @iansltx as assignee on this ticket per his suggestion of an alternate approach on the datastore side of this that he will be implementing