chore(CI): Split next-form tests into smaller suites/files that can be run more-in-parallel

Author: bgw

test/e2e/app-dir/next-form/default/app-dir.test.ts

@@ -0,0 +1,3 @@
+import { runSharedTests } from './shared-tests.util'
+
+runSharedTests('app')

test/e2e/app-dir/next-form/default/next-form.test.ts

@@ -0,0 +1,3 @@
+import { runSharedTests } from './shared-tests.util'
+
+runSharedTests('pages')