vitests: Set global retry

This sets retry globally to `3`, so we don't have to add it to the tests individually.

For the tests that are reliable this shouldn't have any effect, but it will trigger on tests that proved to be a bit flakey (like revisit tests).

vitest.config.ts

@@ -1,6 +1,7 @@
-import react from '@vitejs/plugin-react';
 import path from 'path';
 
+import react from '@vitejs/plugin-react';
+
 const config = {
   plugins: [react()],
   test: {
@@ -18,6 +19,7 @@ const config = {
     testTimeout: 10000,
     fileParallelism: false,
     exclude: ['./pkg/lib/**', '**/node_modules/**', '**/dist/**'],
+    retry: 3,
   },
   reporters: ['default', 'junit'],
   outputFile: {