chore(extensions): migrate to Jest 30 (#3010)

Install Jest 30 peer dependencies as required by @backstage/cli 0.36.0
and fix test incompatibilities for Jest 30 and JSDOM 27.

Resolves: https://redhat.atlassian.net/browse/RHDHBUGS-3064

Signed-off-by: Jon Koops <jonkoops@gmail.com>

Author: jonkoops

workspaces/extensions/package.json

@@ -48,7 +48,12 @@
     "@backstage/e2e-test-utils": "^0.1.2",
     "@backstage/repo-tools": "^0.17.0",
     "@changesets/cli": "^2.27.1",
+    "@jest/environment-jsdom-abstract": "^30.3.0",
     "@playwright/test": "1.58.2",
+    "@types/jest": "^30.0.0",
+    "@types/jsdom": "^27.0.0",
+    "jest": "^30.3.0",
+    "jsdom": "^27.1.0",
     "knip": "^5.27.4",
     "minimatch": "3",
     "node-gyp": "^9.0.0",

workspaces/extensions/plugins/extensions/src/components/PluginIcon.test.tsx

@@ -40,7 +40,7 @@ describe('PluginIcon', () => {
     const { getByRole } = render(<PluginIcon plugin={testPlugin} size={40} />);
     expect(getByRole('img')).toBeInTheDocument();
     expect(getByRole('img').style.backgroundImage).toEqual(
-      'url(https://backstage.io/icons/test-plugin.png)',
+      'url("https://backstage.io/icons/test-plugin.png")',
     );
   });