Convert `link.module.css` to CSS modules (#40584)

...ick-behavior-question-with-filter-causes-error.cy.spec.js

.../components/ImpersonationModal/ImpersonationModalView.tsx

.../components/ImpersonationWarning/ImpersonationWarning.tsx

.../admin/databases/components/DatabaseList/DatabaseList.jsx

frontend/src/metabase/admin/people/components/AddRow.jsx

...nd/src/metabase/admin/people/components/GroupsListing.jsx

...src/metabase/admin/people/containers/UserSuccessModal.jsx

...CollectionPermissionsModal/CollectionPermissionsModal.jsx

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

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

frontend/src/metabase/admin/tasks/containers/JobInfoApp.jsx

frontend/src/metabase/admin/tasks/containers/TasksApp.jsx

...base/collections/components/CollectionCopyEntityModal.jsx

...se/components/ChannelSetupMessage/ChannelSetupMessage.jsx

...end/src/metabase/components/ErrorDetails/ErrorDetails.tsx

frontend/src/metabase/components/LeftNavPane/LeftNavPane.jsx

...src/metabase/components/PasswordReveal/PasswordReveal.jsx

frontend/src/metabase/components/Triggerable/Triggerable.jsx

...rc/metabase/core/components/ExternalLink/ExternalLink.tsx

frontend/src/metabase/css/core/link.module.css