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/layout/config/sidebarItems/settings.js

@@ -127,7 +127,6 @@ const settings = accountId => ({
       meta: {
         permissions: ['administrator'],
       },
-      globalConfigFlag: 'csmlEditorHost',
       toState: frontendURL(`accounts/${accountId}/settings/agent-bots`),
       toStateName: 'agent_bots',
       featureFlag: FEATURE_FLAGS.AGENT_BOTS,

app/javascript/dashboard/components/layout/sidebarComponents/SecondaryNavItem.vue

@@ -49,13 +49,6 @@ export default {
       return !!this.menuItem.children;
     },
     isMenuItemVisible() {
-      if (this.menuItem.globalConfigFlag) {
-        // this checks for the `csmlEditorHost` flag in the global config
-        // if this is present, we toggle the CSML editor menu item
-        // TODO: This is very specific, and can be handled better, fix it
-        return !!this.globalConfig[this.menuItem.globalConfigFlag];
-      }
-
       let isFeatureEnabled = true;
       if (this.menuItem.featureFlag) {
         isFeatureEnabled = this.isFeatureEnabledonAccount(