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/store/modules/specs/conversations/mutations.spec.js

@@ -884,6 +884,17 @@ describe('#mutations', () => {
     });
   });
 
+  describe('#DELETE_CONVERSATION', () => {
+    it('should delete a conversation', () => {
+      const state = {
+        allConversations: [{ id: 1, messages: [] }],
+      };
+
+      mutations[types.DELETE_CONVERSATION](state, 1);
+      expect(state.allConversations).toEqual([]);
+    });
+  });
+
   describe('#SET_LIST_LOADING_STATUS', () => {
     it('should set listLoadingStatus to true', () => {
       const state = {