Remove `jest` dependency (#459)

Description of changes

Remove jest dependencies and test files. This is in preparation to start using playwright instead.

package.json

@@ -27,7 +27,6 @@
 		"lint": "eslint . --ext .ts",
 		"lint:fix": "eslint . --ext .ts --fix",
 		"prepublishOnly": "npm run build",
-		"test": "jest --verbose --coverage",
 		"test:webview": "npm run build && node ./scripts/setup-webview-test-env.js"
 	},
 	"dependencies": {
@@ -54,17 +53,14 @@
 		"@storybook/addon-links": "^6.4.0-beta.4",
 		"@storybook/html": "^6.4.0-beta.4",
 		"@storybook/theming": "^6.4.0-beta.4",
-		"@types/jest": "^26.0.20",
 		"@typescript-eslint/eslint-plugin": "^2.23.0",
 		"@vscode/codicons": "^0.0.22",
-		"babel-jest": "^27.2.4",
 		"babel-loader": "^8.2.2",
 		"babel-plugin-transform-class-properties": "^6.24.1",
 		"eslint": "6.8.0",
 		"eslint-config-prettier": "6.10.1",
 		"eslint-plugin-import": "^2.25.2",
 		"gh-pages": "^3.1.0",
-		"jest": "^27.2.4",
 		"prettier": "^2.2.1",
 		"rollup": "^2.40.0",
 		"rollup-plugin-delete": "^2.0.0",

src/utilities/theme/applyTheme.spec.ts

@@ -1,10 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT License.
-
-const sum = (a, b) => {
-	return a + b;
-};
-
-test('temporary test', () => {
-	expect(sum(1, 2)).toBe(3);
-});