[WEB-1900] chore: mentions mutation, ui fix on app sidebar notification badge, and back button inbox issue notification embed (#5083)

* chore: mention notification boolean field

* chore: handled mentions and all notification mutation and UI fix on the app sidebar notification badge and Back redirection button on inbox issue resposiveness

* chore: Moved everthing to chip

* chore: cleaning up the selection when we unmount the page

* chore: resolved build error

---------

Co-authored-by: NarayanBavisetti <narayan3119@gmail.com>

apiserver/plane/app/serializers/notification.py

@@ -12,6 +12,7 @@ class NotificationSerializer(BaseSerializer):
         read_only=True, source="triggered_by"
     )
     is_inbox_issue = serializers.BooleanField(read_only=True)
+    is_mentioned_notification = serializers.BooleanField(read_only=True)
 
     class Meta:
         model = Notification

apiserver/plane/app/views/notification/base.py

@@ -1,5 +1,5 @@
 # Django imports
-from django.db.models import Exists, OuterRef, Q
+from django.db.models import Exists, OuterRef, Q, Case, When, BooleanField
 from django.utils import timezone
 
 # Third party imports
@@ -60,6 +60,13 @@ class NotificationViewSet(BaseViewSet, BasePaginator):
             )
             .filter(entity_name="issue")
             .annotate(is_inbox_issue=Exists(inbox_issue))
+            .annotate(
+                is_mentioned_notification=Case(
+                    When(sender__icontains="mentioned", then=True),
+                    default=False,
+                    output_field=BooleanField(),
+                )
+            )
             .select_related("workspace", "project", "triggered_by", "receiver")
             .order_by("snoozed_till", "-created_at")
         )