Migrate gemini agents away from Untooled (#4505)

* Migrate gemini agents away from `Untooled`

* disable agents for gemma models as they are not supported for tool calling

* Dev build
resolve #4452 via function name prefix and then stripping within provider

Author: timothycarambat

.github/workflows/dev-build.yaml

@@ -6,7 +6,7 @@ concurrency:
 
 on:
   push:
-    branches: ['improve-url-handler-collector'] # put your current branch to create a build. Core team only.
+    branches: ['gemini-migration-agents'] # put your current branch to create a build. Core team only.
     paths-ignore:
       - '**.md'
       - 'cloud-deployments/*'