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.run_playwright.sh

@@ -37,13 +37,18 @@ EOF
 
 # Run Playwright test
 # NB: do not exit the script if some testcases fail
-${MME2E_DC_SERVER} exec -i -u "$MME2E_UID" -- playwright bash -c "cd e2e-tests/playwright && npm run test -- ${TEST_FILTER}" | tee ../playwright/logs/playwright.log || true
+${MME2E_DC_SERVER} exec -i -u "$MME2E_UID" -- playwright bash -c "cd e2e-tests/playwright && npm run test:ci -- ${TEST_FILTER}" | tee ../playwright/logs/playwright.log || true
 
 # Collect run results
 # Documentation on the results.json file: https://playwright.dev/docs/api/class-testcase#test-case-expected-status
 # NB: the following line is needed only for compatibility reasons, to support RollingRelease tests for versions prior to v10.1.0
 #     It can be removed after releases <=v10.0.x are phased out
 mv -v ../playwright/playwright-report/results.json ../playwright/results/reporter/results.json 2>/dev/null || true
+
+# NB: the following line is needed only for compatibility reasons, to support RollingRelease tests for versions prior to v10.6.0
+#     It can be removed once 10.5 (ESR) is no longer supported
+mv -v ../playwright/test/results/ ../playwright/ 2>/dev/null || true
+
 jq -f /dev/stdin ../playwright/results/reporter/results.json > ../playwright/results/summary.json <<EOF
 {
   passed: .stats.expected,