Migrate from Jest to Vitest

This migrates our tests from using the Jest testing framework to Vitest.

vitest.config.ts

@@ -0,0 +1,31 @@
+import react from '@vitejs/plugin-react';
+
+const config = {
+  plugins: [react()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./src/test/setup.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: 'text',
+    },
+    server: {
+      deps: {
+        inline: ['@patternfly', 'clsx'],
+      },
+    },
+    fileParallelism: false,
+    testTimeout: 10000,
+  },
+  resolve: {
+    mainFields: ['module'],
+  },
+  esbuild: {
+    loader: 'tsx',
+    include: /src\/.*\.[tj]sx?$/,
+    exclude: [],
+  },
+};
+
+export default config;