Move CLI generation templates to universe (#3288)

## Changes
The templates are being added to universe in PR number: #1197781

## Why
Co-versioning the templates with genkit allows us to catch regressions
early.

## Tests
Manually. The generated CLI code remains identical after this change.

Author: shreyas-goenka

.codegen.json

@@ -1,14 +1,7 @@
 {
-    "mode": "cli_legacy",
+    "mode": "cli_v0",
     "api_changelog": true,
     "formatter": "go run golang.org/x/tools/cmd/goimports@latest -w $FILENAMES && go fmt ./...",
-    "services": {
-        ".codegen/service.go.tmpl": "cmd/{{if .IsAccounts}}account{{else}}workspace{{end}}/{{(.TrimPrefix \"account\").KebabName}}/{{(.TrimPrefix \"account\").KebabName}}.go"
-    },
-    "batch": {
-        ".codegen/cmds-workspace.go.tmpl": "cmd/workspace/cmd.go",
-        ".codegen/cmds-account.go.tmpl": "cmd/account/cmd.go"
-    },
     "version": {
         "experimental/python/README.md": "version $VERSION or above",
         "experimental/python/databricks/bundles/version.py": "__version__ = \"$VERSION\"",