[release-10.11] Automate setup-go-work as a dependency for Make targets (#35780)

* Automate setup-go-work as a dependency for Make targets (#35476)

* automate setup-go-work

It's all to easy to forget to `make setup-go-work`, only to run into mysterious build failures. Let's default to doing this automatically, unless `SKIP_SETUP_GO_WORK` is true (or the legacy `IGNORE_GO_WORK_IF_EXISTS`, which was oddly named, since we can't actually ignore it.)

* Make setup-go-work recipe fail-fast with set -e

* ci: post success to required e2e status contexts when no relevant changes (#35880)

* ci: post correct skip status from within cypress/playwright reusable workflows

The 'Required Status Checks' ruleset requires e2e-test/cypress-full/enterprise
and e2e-test/playwright-full/enterprise on master and release-*.* branches.
When a PR has no E2E-relevant changes, the jobs were silently skipped, leaving
required statuses unset and the PR permanently blocked.

Architecture fix: instead of a separate skip-e2e job in the caller that
hardcodes status context names, the skip logic now lives inside the reusable
workflows that already own and compute those context names.

Changes:
- e2e-tests-cypress.yml: add should_run input (default 'true') + skip job
  that uses the dynamically-computed context_name when should_run == 'false'
- e2e-tests-playwright.yml: same pattern
- e2e-tests-ci.yml: change e2e-cypress/e2e-playwright job conditions from
  should_run == 'true' to PR_NUMBER != '' (always run when there's a PR),
  pass should_run as input to both reusable workflows

* Add E2E template workflows for Cypress and Playwright

* Add check-e2e-test-only action for E2E workflow

* Fix: Remove circular E2E workflow file check - skip tests when only CI files change

* Add pull_request trigger to E2E workflow - run automatically on PR events

* Fix resolve-pr to use github.event context for automatic pull_request trigger

* Fix checkout condition to work with pull_request events

* Fix: Remove orphaned fi statement in check-changes script

---------

Co-authored-by: yasser khan <attitude3cena.yf@gmail.com>

server/config.mk

@@ -26,3 +26,10 @@ LDAP_DATA ?= test
 
 # Mock the CWS.
 MM_ENABLE_CWS_MOCK ?= false
+
+# Skip running setup-go-work automatically.
+# IGNORE_GO_WORK_IF_EXISTS is supported for backwards compatibility.
+ifdef IGNORE_GO_WORK_IF_EXISTS
+SKIP_SETUP_GO_WORK ?= $(IGNORE_GO_WORK_IF_EXISTS)
+endif
+SKIP_SETUP_GO_WORK ?= false