feat: Move workspaces under organizations (#1109)

This removes split ownership for workspaces. They are now
a resource of organizations and have a designated owner,
which is a user.

This enables simple administration for commands like:
- `coder stop ben/dev`
- `coder build logs colin/arch`

or if we decide to allow administrators to access workspaces,
they could even SSH using this syntax: `coder ssh colin/dev`.

coderd/templates_test.go

@@ -47,7 +47,7 @@ func TestDeleteTemplate(t *testing.T) {
 		version := coderdtest.CreateTemplateVersion(t, client, user.OrganizationID, nil)
 		template := coderdtest.CreateTemplate(t, client, user.OrganizationID, version.ID)
 		coderdtest.AwaitTemplateVersionJob(t, client, version.ID)
-		coderdtest.CreateWorkspace(t, client, codersdk.Me, template.ID)
+		coderdtest.CreateWorkspace(t, client, user.OrganizationID, template.ID)
 		err := client.DeleteTemplate(context.Background(), template.ID)
 		var apiErr *codersdk.Error
 		require.ErrorAs(t, err, &apiErr)