Fix jest tests (#33688)

As of https://github.com/element-hq/element-web/pull/33573 (some?)
jest tests fail with "SyntaxError: Cannot use import statement outside a module"
when importing js-sdk. It removes js-sdk from moduleNameMapper in jest config
although I'm not sure why. This puts it back so js-sdk resolves to the
copy linked by our pnpm link script, which also makes get transformed.

apps/web/jest.config.ts

@@ -35,6 +35,7 @@ const config: Config = {
         "\\.(gif|png|ttf|woff2)$": "<rootDir>/__mocks__/imageMock.js",
         "\\.svg$": "<rootDir>/__mocks__/svg.js",
         "\\$webapp/i18n/languages.json": "<rootDir>/__mocks__/languages.json",
+        "^matrix-js-sdk(.*)$": "<rootDir>/../../node_modules/matrix-js-sdk$1",
         "^react$": "<rootDir>/node_modules/react",
         "^react-dom$": "<rootDir>/node_modules/react-dom",
         "decoderWorker\\.min\\.js": "<rootDir>/__mocks__/empty.js",