Allow numeric emoji names in validation

Sometimes the frontend sends numeric emoji names as numbers instead
of strings. Previously the backend would raise an ArgumentError when
it received a number. This modifies the backend to convert all values
to string before validating they are actual emoji names, thereby
fixing the bug.

app/finders/award_emojis_finder.rb

@@ -41,7 +41,7 @@ class AwardEmojisFinder
   def validate_name_param
     return unless params[:name]
 
-    raise ArgumentError, 'Invalid name param' unless params[:name].in?(Gitlab::Emoji.emojis_names)
+    raise ArgumentError, 'Invalid name param' unless params[:name].to_s.in?(Gitlab::Emoji.emojis_names)
   end
 
   def validate_awarded_by_param

changelogs/unreleased/210335-fix-handling-of-numeric-emoji-names.yml

+---
+title: Fix backend validation of numeric emoji names
+merge_request: 27101
+author:
+type: fixed

spec/finders/award_emojis_finder_spec.rb

@@ -20,6 +20,11 @@ describe AwardEmojisFinder do
       )
     end
 
+    it 'does not raise an error if `name` is numeric' do
+      subject = described_class.new(issue_1, { name: 100 })
+      expect { subject.execute }.not_to raise_error
+    end
+
     it 'raises an error if `awarded_by` is invalid' do
       expectation = [ArgumentError, 'Invalid awarded_by param']