feat: Add Additional billing account check before enabling apis

Implements checks within ensureApisEnabled to verify project billing status.
If billing is not enabled, the function attempts to automatically resolve the issue:

1. Lists available billing accounts.
2. If exactly one open billing account is found, it attaches the project to this account.
3. Provides informative error messages and instructions for manual intervention if automatic attachment is not possible (e.g., no accounts, multiple accounts, or no open accounts).

ex - https://screenshot.googleplex.com/44vvzE2WKptxA4p