Use `remove_added_uploads()` in `tearDown()` for XMLRPC tests

This cleanup avoids false test failures due to incrementing filenames in the uploads directory.

Fixes #30290

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Document default arguments for `WP_Comment_Query` class as a hash notation.

Props boonebgorges, DrewAPicture.
See #30111.

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git-svn-id: http://core.svn.wordpress.org/trunk@30280 1a063a9b-81f0-0310-95a4-ce76da25c4cd