chore: join owner, template, and org in new workspace view (#15116)

Joins in fields like `username`, `avatar_url`, `organization_name`,
`template_name` to `workspaces` via a **view**. 
The view must be maintained moving forward, but this prevents needing to
add RBAC permissions to fetch related workspace fields.

coderd/httpmw/workspaceagentparam_test.go

@@ -31,7 +31,7 @@ func TestWorkspaceAgentParam(t *testing.T) {
 				UserID: user.ID,
 			})
 			tpl       = dbgen.Template(t, db, database.Template{})
-			workspace = dbgen.Workspace(t, db, database.Workspace{
+			workspace = dbgen.Workspace(t, db, database.WorkspaceTable{
 				OwnerID:    user.ID,
 				TemplateID: tpl.ID,
 			})