feat: Implement UI for Agent Bots in settings and remove CSML support (#11276)

- Add agent bots management UI in settings with avatar upload
- Enable agent bot configuration for all inbox types
- Implement proper CRUD operations with webhook URL support
- Fix agent bots menu item visibility in settings sidebar
- Remove all CSML-related code and features
- Add migration to convert existing CSML bots to webhook bots
- Simplify agent bot model and services to focus on webhook bots
- Improve UI to differentiate between system bots and account bots

## Video 





https://github.com/user-attachments/assets/3f4edbb7-b758-468c-8dd6-a9537b983f7d

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/components-next/dialog/Dialog.vue

@@ -125,7 +125,10 @@ defineExpose({ open, close });
           <slot />
           <!-- Dialog content will be injected here -->
           <slot name="footer">
-            <div class="flex items-center justify-between w-full gap-3">
+            <div
+              v-if="showCancelButton || showConfirmButton"
+              class="flex items-center justify-between w-full gap-3"
+            >
               <Button
                 v-if="showCancelButton"
                 variant="faded"