Fix param retrieval for async client paginated calls

[garretruh]

What does this PR do?

Fixes #1950

Additional Notes

Support for paginated methods in AsyncApiClient was added in #1615. Looking through the commits for that PR, it appears a get_pagination_params method was added in 6803354 and then removed in the subsequent d68565b in favor of gather_params. A couple call sites were updated but this one was not.

Review checklist

Please check relevant items below:

• This PR includes all newly recorded cassettes for any modified tests.
• This PR does not rely on API client schema changes.
  • The CI should be fully passing.
• Or, this PR relies on API schema changes and this is a Draft PR to include tests for that new functionality.
  • Note: CI shouldn't be run on this Draft PR, as its expected to fail without the corresponding schema changes.

[skarimo]

Thanks!