feat(cli): add logs cmd (#21430)

This PR adds a command to view the provisioner and agent logs for a
given workspace.
Note: I did investigate using the existing `cliui` methods to tail the
logs but they are tailored to a very specific use-case.

Other changes:
- Adds `Agents` to `dbfake.WorkspaceResponse`
- Adds methods to generate provisioner and agent logs in `dbgen`

---------

Co-authored-by: Steven Masley <Emyrk@users.noreply.github.com>

cli/root.go

@@ -117,6 +117,7 @@ func (r *RootCmd) CoreSubcommands() []*serpent.Command {
 		r.deleteWorkspace(),
 		r.favorite(),
 		r.list(),
+		r.logs(),
 		r.open(),
 		r.ping(),
 		r.rename(),