More adjustments and improvements for inline documentation for get_pages(). see #25186.

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Upgrader: Make clearing the Plugin and Theme update caches optional during install and upgrade proceedures. See #22704

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Short descriptions for inline docs should end with a period, per the vast majority of core. see #25229.

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WP_Filesystem: FTP Sockets: Avoid using the file_exists() / is_exists() / exists() PemFTP functionality as it's buggy on ncFTPd servers, switching to listing the file instead which is what we use for the FTP Extension transport. Fixes #14049

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Deprecate get_blogaddress_by_domain(), unused since [25261]. props jeremyfelt. fixes #25235.
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Use correct array key for filling the attachment title in image_attachment_fields_to_save(). props pross.
Use wp_basename() to avoid issues with UTF-8 characters.
fixes #25236.
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Add new ajax_query_attachments_args filter.

props alex-ye.
fixes #24285.

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