Do not autoformat intersecting styles

[tomalec]

This is a followup after #1239 (comment)

📝 Provide a description of the improvement

Currently, we support autoformatting the intersecting styles in many cases.

Text in _italic and **bo_ld** - > "Text in italic and bold"

After #7346 we will no longer support it in with <code>/`, as it was found confusing and undesired. It put us in a position where.

• The behavior is inconsistent among inline styles. Text in _italic and **bo_ld** creates interesting styles, while Text in _italic and `bo_ld` don't.
• There is a remaining question of whether intersecting styles are confusing in general - for other styles as well.

Neither Slack, Github, nor Notion supports that.

If we are about to drop this feature, autoformatting logic could be simplified to only handle currently focused text nodes.

📃 Other details

• Browser: n/a
• OS: n/a
• CKEditor version: https://github.com/ckeditor/ckeditor5/tree/a50e0962a1bd8f2c2ad0b809ecdd963b03397af3
• Installed CKEditor plugins: Autoformat

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[tomalec]

Note, that GitHub Writer also does not support intersecting styles. Additionally, it handles markers that starts from the beginning of a line or whitespace.

[CKEditorBot]

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[CKEditorBot]

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