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/tsconfig.json

@@ -1,19 +0,0 @@
-{
-    "compilerOptions": {
-        "esModuleInterop": true,
-        "strict": true,
-        "strictNullChecks": true,
-        "skipLibCheck": true,
-        "noEmit": true,
-        "baseUrl": ".",
-        "paths": {
-            "@mattermost/client/*": ["../../webapp/platform/client/lib/*"],
-            "@mattermost/types/*": ["../../webapp/platform/types/lib/*"],
-            "@e2e-support/*": ["support/*"],
-            "@e2e-test.config": ["test.config.ts"],
-            "@e2e-types": ["types.ts"]
-        }
-    },
-    "include": ["./**/*"],
-    "exclude": ["playwright-report"]
-}