Upgrade to jest 27 (#7699)

* use jest@27.4.0, replace jest-environment-jsdom-sixteen with jest-environment-jsdom

Signed-off-by: Kerry Archibald <kerrya@element.io>

* polyfill setImmediate

Signed-off-by: Kerry Archibald <kerrya@element.io>

* remove done from async test cases

* useRealTimers in test relying on promise flushing

Signed-off-by: Kerry Archibald <kerrya@element.io>

* remove jest environment file

Signed-off-by: Kerry Archibald <kerrya@element.io>

* replace ts-jest mocked with jest utils mocked

Signed-off-by: Kerry Archibald <kerrya@element.io>

package.json

@@ -176,9 +176,9 @@
     "eslint-plugin-react": "^7.22.0",
     "eslint-plugin-react-hooks": "^4.2.0",
     "glob": "^7.1.6",
-    "jest": "^26.6.3",
+    "jest": "^27.4.0",
     "jest-canvas-mock": "^2.3.0",
-    "jest-environment-jsdom-sixteen": "^1.0.3",
+    "jest-environment-jsdom": "^27.0.6",
     "jest-fetch-mock": "^3.0.3",
     "jest-raw-loader": "^1.0.1",
     "matrix-mock-request": "^1.2.3",
@@ -191,7 +191,6 @@
     "stylelint": "^13.9.0",
     "stylelint-config-standard": "^20.0.0",
     "stylelint-scss": "^3.18.0",
-    "ts-jest": "^27.1.3",
     "typescript": "4.5.3",
     "walk": "^2.3.14"
   },
@@ -202,7 +201,7 @@
     "snapshotSerializers": [
       "enzyme-to-json/serializer"
     ],
-    "testEnvironment": "./__test-utils__/environment.js",
+    "testEnvironment": "jsdom",
     "testMatch": [
       "<rootDir>/test/**/*-test.[jt]s?(x)"
     ],