Theme.json schema: Remove CSS from block style variations and elements

[carolinan]

Description

According to the schema, theme.json allows using "css" under styles > blocks >block name > variations > variation name > css, and styles > elements > element > css.

However, this is not implemented yet, the CSS is not applied in the editors or the front,
and I expect there to be a warning in my code editor if theme.json includes this feature.

Step-by-step reproduction instructions

In theme.json, try to apply custom CSS to a block variation and element.
Note that there are no warnings, and that the styles are not applied in the editor and front.

Example:

	"styles": {
		"blocks": {
      "core/separator": {
				"css": "border:10px solid purple; max-width:100px",
				"variations": {
					"default": {
						"css": "border:10px solid blue"
					},
					"wide": {
						"css": "border:10px solid red"
					}
				}
			},
			"core/button":{
				"variations": {
					"outline": {
						"css": "color:blue"
					}
				}
			}
		},
		"elements": {
			"button": {
				"css": "color:red"
			},
			"heading": {
				"css": "border:10px solid green"
			}
		}
	},

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[t-hamano]

I tested this again and it seems that the css works on both elements and variations in WP6.6.

The screenshot below shows that all of the CSS is applied when using the theme.json provided in this issue.

Therefore, I would like to close this issue.