Enable Cypress and Playwright retries (#29056)

* Enable Cypress and Playwright retries
* Improve E2E commit status messages
* Demote unstable testcases, increase task timeout

e2e-tests/.ci/server.run_playwright.sh

@@ -43,7 +43,7 @@ ${MME2E_DC_SERVER} exec -i -u "$MME2E_UID" -- playwright bash -c "cd e2e-tests/p
 # 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/results.json || true
+mv -v ../playwright/playwright-report/results.json ../playwright/results/results.json 2>/dev/null || true
 jq -f /dev/stdin ../playwright/results/results.json > ../playwright/results/summary.json <<EOF
 {
   passed: .stats.expected,