apply core-imports codemod to all packages and plugins

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/sentry/dev/index.tsx

@@ -15,7 +15,6 @@
  */
 
 import { Entity } from '@backstage/catalog-model';
-import { Content, Header, Page } from '@backstage/core';
 import { createDevApp, EntityGridItem } from '@backstage/dev-utils';
 import { EntityProvider } from '@backstage/plugin-catalog-react';
 import { Grid } from '@material-ui/core';
@@ -28,6 +27,7 @@ import {
   sentryApiRef,
 } from '../src';
 import { SENTRY_PROJECT_SLUG_ANNOTATION } from '../src/components/useProjectSlug';
+import { Content, Header, Page } from '@backstage/core-components';
 
 const entity = (name?: string) =>
   ({