fix: Fix issue with profile picture not updating (#10532)

This PR resolves the issue with updating the profile picture in the profile settings.

**Cause of issue**
The issue can be reproduced with the old `ProfileAvatar.vue` component.
While the exact reason is unclear, it seems related to cases where the
file might be `null`.

**Solution**
Replaced the old `ProfileAvatar.vue` with `Avatar.vue` and tested it. It
works fine. I’ve attached a loom video below.

Fixes https://linear.app/chatwoot/issue/CW-3768/profile-picture-bug

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

app/javascript/dashboard/components-next/avatar/Avatar.vue

@@ -132,7 +132,7 @@ const iconStyles = computed(() => ({
 }));
 
 const initialsStyles = computed(() => ({
-  fontSize: `${props.size > 32 ? 16 : props.size / 2}px`,
+  fontSize: `${Math.min(props.size / 2.5, 24)}px`,
 }));
 
 const invalidateCurrentImage = () => {