feat: Add new message bubbles (#10481)

---------

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

app/javascript/dashboard/components-next/message/bubbles/Activity.vue

@@ -0,0 +1,16 @@
+<script setup>
+import BaseBubble from './Base.vue';
+
+defineProps({
+  content: {
+    type: String,
+    required: true,
+  },
+});
+</script>
+
+<template>
+  <BaseBubble class="px-2 py-0.5" data-bubble-name="activity">
+    <span v-dompurify-html="content" />
+  </BaseBubble>
+</template>