Fix `Rails/WhereExists` cop in app/services (#28853)

.rubocop_todo.yml

@@ -86,8 +86,6 @@ Rails/WhereExists:
     - 'app/models/status.rb'
     - 'app/policies/status_policy.rb'
     - 'app/serializers/rest/announcement_serializer.rb'
-    - 'app/services/activitypub/fetch_remote_status_service.rb'
-    - 'app/services/vote_service.rb'
     - 'app/workers/move_worker.rb'
     - 'spec/models/account_spec.rb'
     - 'spec/services/activitypub/process_collection_service_spec.rb'

app/services/activitypub/fetch_remote_status_service.rb

@@ -44,7 +44,7 @@ class ActivityPub::FetchRemoteStatusService < BaseService
 
     # If we fetched a status that already exists, then we need to treat the
     # activity as an update rather than create
-    activity_json['type'] = 'Update' if equals_or_includes_any?(activity_json['type'], %w(Create)) && Status.where(uri: object_uri, account_id: actor.id).exists?
+    activity_json['type'] = 'Update' if equals_or_includes_any?(activity_json['type'], %w(Create)) && Status.exists?(uri: object_uri, account_id: actor.id)
 
     with_redis do |redis|
       discoveries = redis.incr("status_discovery_per_request:#{@request_id}")

app/services/vote_service.rb

@@ -19,7 +19,7 @@ class VoteService < BaseService
     already_voted = true
 
     with_redis_lock("vote:#{@poll.id}:#{@account.id}") do
-      already_voted = @poll.votes.where(account: @account).exists?
+      already_voted = @poll.votes.exists?(account: @account)
 
       ApplicationRecord.transaction do
         @choices.each do |choice|