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/.ci/server.generate.sh

@@ -276,7 +276,7 @@ $(if mme2e_is_token_in_list "webhook-interactions" "$ENABLED_DOCKER_SERVICES"; t
 $(if mme2e_is_token_in_list "playwright" "$ENABLED_DOCKER_SERVICES"; then
     echo '
   playwright:
-    image: mcr.microsoft.com/playwright:v1.49.1-noble
+    image: mcr.microsoft.com/playwright:v1.51.1-noble
     entrypoint: ["/bin/bash", "-c"]
     command: ["until [ -f /var/run/mm_terminate ]; do sleep 5; done"]
     env_file: