Customize: Eliminate unnecessary `WP_Customize_Site_Logo_Control` in favor of...

Customize: Eliminate unnecessary `WP_Customize_Site_Logo_Control` in favor of re-using `WP_Customize_Image_Control`.

* Removes double `margin-bottom` from all the media controls.
* All media controls now send `{settingId}-attachment-data` messages to the preview when a media setting is updated so that the preview has access to the attachment data.
* Fixes receiving of `attachment-data` message for `custom_logo` which resulted in instant JS-applied preview not working. See #36096.

See #33755.
Fixes #35941.

Built from https://develop.svn.wordpress.org/trunk@36851


git-svn-id: https://core.svn.wordpress.org/trunk@36818 1a063a9b-81f0-0310-95a4-ce76da25c4cd