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/package.json

@@ -0,0 +1,68 @@
+{
+  "name": "@mattermost/playwright-lib",
+  "version": "10.6.1",
+  "description": "A comprehensive end-to-end testing library for Mattermost web, desktop and plugin applications using Playwright",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mattermost/mattermost.git"
+  },
+  "author": "mattermost",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mattermost/mattermost/issues"
+  },
+  "homepage": "https://github.com/mattermost/mattermost/tree/master/e2e-tests/playwright/lib#readme",
+  "type": "commonjs",
+  "files": [
+    "dist"
+  ],
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "require": "./dist/index.js"
+    }
+  },
+  "keywords": [
+    "mattermost",
+    "e2e",
+    "playwright",
+    "test-automation"
+  ],
+  "scripts": {
+    "build": "rollup -c --bundleConfigAsCjs",
+    "build:watch": "npm run build -- --watch",
+    "build-tsc": "tsc --build --verbose",
+    "build-tsc:watch": "tsc --watch --preserveWatchOutput",
+    "clean": "rm -rf dist node_modules *.tsbuildinfo",
+    "tsc": "tsc -b"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@axe-core/playwright": "4.10.1",
+    "@mattermost/client": "file:../../../webapp/platform/client",
+    "@mattermost/types": "file:../../../webapp/platform/types",
+    "@percy/cli": "1.30.7",
+    "@percy/playwright": "1.0.7",
+    "async-wait-until": "2.0.23",
+    "axe-core": "4.10.3",
+    "deepmerge": "4.3.1",
+    "dotenv": "16.4.7",
+    "mime-types": "3.0.1",
+    "uuid": "11.1.0"
+  },
+  "devDependencies": {
+    "@rollup/plugin-typescript": "12.1.2",
+    "@types/mime-types": "2.1.4",
+    "@types/node": "22.13.14",
+    "@types/react": "19.0.12",
+    "rollup": "4.38.0",
+    "rollup-plugin-copy": "3.5.0"
+  },
+  "peerDependencies": {
+    "@playwright/test": "1.51.1"
+  }
+}