feat: Add conversation delete feature (#11677)

<img width="1240" alt="Screenshot 2025-06-05 at 12 39 04 AM"
src="https://github.com/user-attachments/assets/0071cd23-38c3-4638-946e-f1fbd11ec845"
/>


## Changes

Give the admins an option to delete conversation via the context menu

- enable conversation deletion in routes and controller
- expose delete API on conversations
- add delete option in conversation context menu and integrate with card
and list
- implement store action and mutation for delete
- update i18n with new strings

fixes: https://github.com/chatwoot/chatwoot/issues/947

---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/api/inbox/conversation.js

@@ -137,6 +137,10 @@ class ConversationApi extends ApiClient {
   getInboxAssistant(conversationId) {
     return axios.get(`${this.url}/${conversationId}/inbox_assistant`);
   }
+
+  delete(conversationId) {
+    return axios.delete(`${this.url}/${conversationId}`);
+  }
 }
 
 export default new ConversationApi();