MM-62954 E2E/Playwright shared library (#30177)

* feat: Add package.json for Playwright library with dependencies

* feat: Add explicit exports for test.config in playwright-lib package

* feat: Add initialization setup for Mattermost E2E testing with admin and user client

* fix: Update package dependencies and resolve TypeScript build errors

* feat: Update package exports for test.config to support both CommonJS and ESM

* playwright shared library

* add README, fix pipeline

* keep file structures, move report up to playwright

* minimize API, use the prerelease versions of client and types

* bump version

* update package*.json

* resolve merge conflict

* update depedencies and merge conflicts

* update readme and fix ci

* remove unnecessary export and list all external packages

* fix import for Client4

e2e-tests/playwright/lib/tsconfig.json

@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "outDir": "dist",
+        "target": "ES2022",
+        "esModuleInterop": true,
+        "strict": true,
+        "declaration": true,
+        "moduleResolution": "node",
+        "module": "esnext",
+        "resolveJsonModule": true,
+        "skipLibCheck": true,
+        "downlevelIteration": true,
+        "baseUrl": "src",
+        "paths": {
+            "@/*": ["*"]
+        }
+    },
+    "include": ["src"],
+    "exclude": ["node_modules"]
+}