Rails 7 compatibility fix for `Admin::Metrics::Dimension` classes (#25277)

...ib/admin/metrics/dimension/instance_accounts_dimension.rb

...b/admin/metrics/dimension/instance_languages_dimension.rb

app/lib/admin/metrics/dimension/languages_dimension.rb

app/lib/admin/metrics/dimension/query_helper.rb

app/lib/admin/metrics/dimension/servers_dimension.rb

app/lib/admin/metrics/dimension/sources_dimension.rb

app/lib/admin/metrics/dimension/tag_languages_dimension.rb

app/lib/admin/metrics/dimension/tag_servers_dimension.rb

...min/metrics/dimension/instance_accounts_dimension_spec.rb

...in/metrics/dimension/instance_languages_dimension_spec.rb

spec/lib/admin/metrics/dimension/languages_dimension_spec.rb

spec/lib/admin/metrics/dimension/servers_dimension_spec.rb

...min/metrics/dimension/software_versions_dimension_spec.rb

spec/lib/admin/metrics/dimension/sources_dimension_spec.rb

...lib/admin/metrics/dimension/space_usage_dimension_spec.rb

...b/admin/metrics/dimension/tag_languages_dimension_spec.rb

...lib/admin/metrics/dimension/tag_servers_dimension_spec.rb