Declare the `$options` property for `WP_Upgrader_Skin`.

See #30224.

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Declare the `$update_count` and `$update_current` properties for `WP_Upgrader`.

See #30224.

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Declare the `$uploaded_headers` and `$default_headers` properties for `WP_Customize_Header_Image_Control`.

See #30224.

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In `_WP_Editors::editor_settings()`, `$str1` and `$str2` don't need to be initialized empty.

See #30224.

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Split tests for wp_get_sites()

Test various arguments for `wp_get_sites()` in a more intentful way rather than in one large test. Leave tests for limit and offset together for convenience.

See #30080

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