[Tests] Add unit tests for functionsRequestDoc

[gonzaloriestra]

WHY are these changes introduced?

Fixes #0000

Adds unit test coverage for functionsRequestDoc in @shopify/cli-kit.

WHAT is this pull request doing?

Adds unit tests in packages/cli-kit/src/public/node/api/functions.test.ts to verify:

• GraphQL request delegation to graphqlRequestDoc with correct endpoint URL construction using app management FQDN, organization ID, and app ID.
• Argument propagation (API name, token, query, variables, unauthorizedHandler, responseOptions).
• Result propagation from graphqlRequestDoc.

How to test your changes?

CI

Post-release steps

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

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PR created automatically by Jules for task 14335710021318174839 started by @gonzaloriestra

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