Update zoom note service to use ZoomMeeting

Previously the ZoomNotesService looked at the last peice
of the description for a link matching a zoom url
Now it can use the ActiveRecord ZoomMeeting model

app/helpers/issuables_helper.rb

@@ -281,7 +281,7 @@ module IssuablesHelper
     }
 
     data[:hasClosingMergeRequest] = issuable.merge_requests_count(current_user) != 0 if issuable.is_a?(Issue)
-    data[:zoomMeetingUrl] = issuable&.zoom_meetings.added_to_issue.first&.url
+    data[:zoomMeetingUrl] = ZoomMeeting.canonical_meeting_url(issuable)
 
     if parent.is_a?(Group)
       data[:groupPath] = parent.path

app/models/zoom_meeting.rb

@@ -14,4 +14,14 @@ class ZoomMeeting < ApplicationRecord
 
   scope :added_to_issue, -> { where(issue_status: :added) }
   scope :removed_from_issue, -> { where(issue_status: :removed) }
+
+  class << self
+    def canonical_meeting_url(issue)
+      canonical_meeting(issue)&.url
+    end
+
+    def canonical_meeting(issue)
+      issue&.zoom_meetings&.added_to_issue&.first
+    end
+  end
 end

app/services/issues/update_service.rb

@@ -62,7 +62,7 @@ module Issues
         notification_service.async.new_mentions_in_issue(issue, added_mentions, current_user)
       end
 
-      ZoomNotesService.new(issue, project, current_user, old_description: old_associations[:description]).execute
+      ZoomNotesService.new(issue, project, current_user, old_zoom_meetings: old_associations[:zoom_meetings]).execute
     end
 
     def handle_task_changes(issuable)

app/services/zoom_notes_service.rb

 # frozen_string_literal: true
 
 class ZoomNotesService
-  def initialize(issue, project, current_user, old_description: nil)
+  def initialize(issue, project, current_user, old_zoom_meetings: nil)
     @issue = issue
     @project = project
     @current_user = current_user
-    @old_description = old_description
+    @old_zoom_meetings = old_zoom_meetings
   end
 
   def execute
-    return if @issue.description == @old_description
+    return if @issue.zoom_meetings == @zoom_meetings
 
     if zoom_link_added?
       zoom_link_added_notification
-    elsif zoom_link_removed?
+    else
       zoom_link_removed_notification
     end
   end
@@ -21,15 +21,7 @@ class ZoomNotesService
   private
 
   def zoom_link_added?
-    has_zoom_link?(@issue.description) && !has_zoom_link?(@old_description)
-  end
-
-  def zoom_link_removed?
-    !has_zoom_link?(@issue.description) && has_zoom_link?(@old_description)
-  end
-
-  def has_zoom_link?(text)
-    Gitlab::ZoomLinkExtractor.new(text).match?
+    ZoomMeeting.canonical_meeting_url(@issue)
   end
 
   def zoom_link_added_notification