Use AwardEmoji constants for thumbs (ruby)

app/helpers/issues_helper.rb

app/models/award_emoji.rb

app/services/concerns/integrations/project_test_data.rb

ee/spec/controllers/groups/epics/notes_controller_spec.rb

...rojects/security/vulnerabilities/notes_controller_spec.rb

ee/spec/finders/epics_finder_spec.rb

...raphql/resolvers/boards/board_list_epics_resolver_spec.rb

ee/spec/graphql/resolvers/epics_resolver_spec.rb

...ics/cycle_analytics/aggregated/base_query_builder_spec.rb

...c/lib/ee/gitlab/import_export/group/tree_restorer_spec.rb

...b/gitlab/analytics/cycle_analytics/request_params_spec.rb

ee/spec/models/epic_spec.rb

ee/spec/requests/api/award_emoji_spec.rb

ee/spec/requests/api/epics_spec.rb

ee/spec/requests/api/graphql/epics/epics_spec.rb

ee/spec/requests/api/graphql/group/epics_spec.rb

ee/spec/requests/api/graphql/group/work_items_spec.rb

ee/spec/requests/api/graphql/work_item_spec.rb

...c/requests/ee/projects/cycle_analytics_controller_spec.rb

...uests/groups/analytics/cycle_analytics_controller_spec.rb