Remove ts-ignore suppressions from payload store tests

[alfonso-noriega]

WHY are these changes introduced?

Fixes none.

The payload store tests used @ts-ignore to assert test-only merged payload fields, which made the assertions less type-safe than necessary.

WHAT is this pull request doing?

Removes the @ts-ignore suppressions by asserting the updated extension payload with toMatchObject instead of accessing ad-hoc fields directly.

How to test your changes?

• pnpm --filter @shopify/app vitest run src/cli/services/dev/extension/payload/store.test.ts
• pnpm --filter @shopify/app lint

Note: pnpm --filter @shopify/app type-check was attempted locally but failed on existing @shopify/organizations resolution/type errors unrelated to this test-only diff.

Post-release steps

None.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[alfonso-noriega]

• Remove ts-ignore suppressions from payload store tests #8105 👈 (View in Graphite)
• main

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