fix(text): avoid trailing None for paginated response + scalar --query

[mjfxjas]

Fixes #10061.

When an operation is paginated, the text formatter previously applied --query per page. For scalar queries, if subsequent pages did not include the queried field, text output could include an extra trailing None line.

This change buffers the full paginated result before applying --query when using --output text, matching the behavior of the JSON/table formatters.

• Adds a unit test covering the regression.

[mjfxjas]

Friendly follow-up on this behavior fix.

This addresses trailing None output when using paginated responses with scalar --query, and keeps output consistent and clean for scripting use cases. If useful, I can add an additional regression test case in the preferred location.