MM-63669 E2E/Playwright: Move "e2e-tests/playwright/test" to "e2e-tests/playwright" folder (#30647)

* move "e2e-tests/playwright/test" to  "e2e-tests/playwright/test" and expose "ensurePluginsLoaded"

* add test setup, and expose ensurePluginsLoaded and ensureServerDeployment to pw

e2e-tests/playwright/specs/client/schema.ts

@@ -0,0 +1,25 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {z} from 'zod';
+
+const FileInfoSchema = z.object({
+    id: z.string(),
+    user_id: z.string(),
+    channel_id: z.string(),
+    create_at: z.number().int(),
+    update_at: z.number().int(),
+    delete_at: z.number().int(),
+    name: z.string(),
+    extension: z.string(),
+    size: z.number().int(),
+    mime_type: z.string(),
+    mini_preview: z.nullable(z.any()),
+    remote_id: z.string(),
+    archived: z.boolean(),
+});
+
+export const FileUploadResponseSchema = z.object({
+    file_infos: z.array(FileInfoSchema),
+    client_ids: z.array(z.string()),
+});