fix: stabilize shipping preview and pre-filled pickup tests

[lucvysk]

Summary

Fixes flaky/failing checkout UI e2e assertions that diverged by account lean-shipping config and by multi-country trade policy forms.

• Shipping preview labels: assert account-specific delivery options instead of a single hardcoded carrier name
  • Delivery_Scheduled Delivery and Delivery: Expressa on NO_LEAN / CLEAN_NO_MAPS, Prazos variados on lean accounts
  • Delivery_Scheduled Delivery_Scheduled Pickup: Motoboy / PAC by name on non-lean, cheapest by data-testid on lean
• Postal code fill: when #ship-country is present, select BRA before typing the CEP (skip if already selected, so the form is not reset)
• Pickup pre-filled flow: send a complete pickup address payload (isDisposable, city/state/street/geo) with CEP 22011050, and drop the obsolete store-name assertion

Test scenarios

• shipping-preview/Delivery_Scheduled Delivery and Delivery - *.test.js across lean and non-lean accounts
• shipping-preview/Delivery_Scheduled Delivery_Scheduled Pickup - *.test.js (vtexgame1, vtexgame1clean, vtexgame1geo, vtexgame1invoice)
• Postal-code shipping flows that hit fillPostalCodeOmnishipping (accounts with and without #ship-country)
• shipping/Pickup - Pre-filled profile and shipping data - vtexgame1.test.js

[vtex-pr-sentinel]

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[jeffersontuc]

looks good ✅