Convert `loadingDashboards` redux actions to TS (#48456) (#48631)

e2e/test/scenarios/dashboard/tabs.cy.spec.js

frontend/src/metabase-types/api/query.ts

frontend/src/metabase/dashboard/actions/cards-typed.ts

...end/src/metabase/dashboard/actions/data-fetching-typed.ts

frontend/src/metabase/dashboard/actions/data-fetching.js

frontend/src/metabase/dashboard/actions/data-fetching.ts

...src/metabase/dashboard/actions/data-fetching.unit.spec.js

frontend/src/metabase/dashboard/actions/index.ts

frontend/src/metabase/dashboard/reducers-typed.ts

frontend/src/metabase/dashboard/reducers.js

frontend/src/metabase/dashboard/reducers.unit.spec.js

frontend/src/metabase/dashboard/utils.ts