Remove dead code in frontend/src/metabase/admin (#38589)

frontend/src/metabase/admin/databases/database.js

...datamodel/components/FilterWidget/FilterWidget.styled.tsx

...min/datamodel/components/MetricForm/MetricForm.styled.tsx

frontend/src/metabase/admin/datamodel/components/Section.jsx

...se/admin/datamodel/components/UpdateCachedFieldValues.jsx

frontend/src/metabase/admin/datamodel/field.js

frontend/src/metabase/admin/datamodel/table.js

frontend/src/metabase/admin/datamodel/utils.ts

...abase/admin/people/components/GroupSelect/GroupSelect.tsx

...n/people/components/GroupSelect/GroupSelect.unit.spec.tsx

...rc/metabase/admin/people/components/GroupSelect/index.tsx

...components/PermissionsSelect/PermissionsSelect.styled.tsx

...mponents/PermissionsSidebar/PermissionsSidebar.styled.tsx

...s/components/PermissionsTable/PermissionsTable.styled.tsx

...min/settings/components/UploadSettings/UploadSettings.tsx

...idgets/GroupMappingsWidget/GroupMappingsWidget.styled.tsx

...ponents/widgets/PublicLinksListing/PublicLinksListing.jsx

...n/settings/components/widgets/PublicLinksListing/index.js

...settings/components/widgets/SettingInput/SettingInput.tsx

...ettings/slack/components/SlackSetup/SlackSetup.styled.tsx