fix(organizations): update domainJoin E2E test for Node D5 always-create flow (#3680)

[PierreBrisorgueil]

Problem

organizations.domainJoin.e2e.tests.js still tests the old pendingJoin flow:

• "member signs up via UI — sees pending message, no sidenav" expects text=request to join which was the organization-required pending banner
• "member signs in — lands on organization-required" expects URL /organization-required
• "owner approves member join request" polls /organizations/{id}/requests expecting > 0 items

These all fail after pierreb-devkit/Node#3680 (D5 always-create workspace) was merged, since:

1. Domain-match signup now creates a workspace for the user (no pending limbo)
2. User lands on main app with currentOrganization set
3. pendingJoin is gone — suggestedJoin hint returned instead
4. /organizations/{id}/requests returns 0 items at signup

Affected file

src/modules/organizations/tests/organizations.domainJoin.e2e.tests.js

Steps to reproduce

Run npx playwright test organizations.domainJoin.e2e.tests.js against pierreb-devkit/Node@master (post-#3680). Test "member signs up via UI — sees pending message, no sidenav" fails with element(s) not found.

Fix

Update 3 tests to assert landing on main app (not org-required), drop approval test, keep access control tests unchanged.

Downstream workaround shipped in comes-io/trawl_vue#908.

[PierreBrisorgueil]

Shipped via #4182 (squash merged at 12:37 UTC, commit 9f5bdc1). Includes 3 CR review iterations: env-agnostic URL assertions (test env vs dev), COOKIE_PREFIX derivation from config.cookie.prefix, isApiAvailable transport-level reachability, named isPostSignupRoute + seedSuggestedJoinLocalStorage helpers. Side fix: removed stale Vue repo var E2E_NODE_REF=feat/phase-2-orgs (Mar 14 pin pre-D5) — CI now defaults to Node master.