Prevent heading to list conversion using autoformat

[mlewand]

📝 Provide a description of the new feature

I noticed that you can't turn a heading into a list by typing `1. `. You can, however, by typung `* `. That makes a lot of sense. I was just trying to number the headings (as steps) and I was positively surprised that Notion devs predicted this case. It makes a lot of sense to me.

Originally posted by @Reinmar in #6170 (comment)

We should also discsus whether this issue should be a default behavior or an opt-in.

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[robclancy]

I don't understand how an issue that means you can't make headings starting with numbers at all is not fixed after so long.

EDIT: extra frustrating and honestly unacceptable is that autoformat doesn't have a single setting other than on and off. It checks if lists are enabled in the editor to decide if it should format instead of having actual configuration. Now we have to disable the entire feature so that our users can do something as simple as write a number.

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[CKEditorBot]

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