feat: add prompt suggestions and June events (#10726)

This PR adds the following two features

1. Prompt suggestions to get started with Copilot Chat
2. June events for each action

![CleanShot 2025-01-20 at 21 00
52@2x](https://github.com/user-attachments/assets/d73e7982-0f78-4d85-873e-da2c16762688)

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Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/i18n/locale/en/conversation.json

@@ -353,5 +353,8 @@
     "ONE": "{user} is typing",
     "TWO": "{user} and {secondUser} are typing",
     "MULTIPLE": "{user} and {count} others are typing"
+  },
+  "COPILOT": {
+    "TRY_THESE_PROMPTS": "Try these prompts"
   }
 }