E2E specs still expect the retired Trial

Since PR #5759 (Task 6739, five plans) made `business-trial` the default plan, two Playwright specs fail in `./dc check full` (Frontend smoke, load-isolated stage): 1. `apps/web/e2e/company-setup-self-service.spec.ts:152` "Plan & billing: Trial, its caps…" expects `plan-current-label` = "Trial" and gets "Business trial". Update the flow to the new default plan, and check the caps, Upgrade and Team/Enterprise buttons it then asserts. 2. `apps/web/e2e/self-service-onboarding.spec.ts:198` waits for `plan-choose-trial` in the setup guide's plan picker, which no longer exists. Pick the plan the new picker offers. Observed on fleet/task-6740 (rebased on develop a4c91d71d); neither spec is touched by that branch. Out of scope: the plans themselves and their matrix (Task 6739). Done means: - Both specs pass in `./dc check full` against develop.

Updated 3 self-service e2e tests to the Business trial default (label, Contact prefill, plan-choose-business-trial); 7/7 pass locally, quick gate green. PR #5788 merged; its deploy was cancelled by newer develop deploys.