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/.e2erc

@@ -98,7 +98,7 @@ case "${TEST:-$TEST_DEFAULT}" in
   cypress )
     export TEST_FILTER_DEFAULT='--stage=@prod --group=@smoke' ;;
   playwright )
-    export TEST_FILTER_DEFAULT='tests/functional/system_console/system_users/actions.spec.ts --project=chrome' ;;
+    export TEST_FILTER_DEFAULT='functional/system_console/system_users/actions.spec.ts' ;;
   * )
     export TEST_FILTER_DEFAULT='' ;;
 esac