fix(editor): add footnote url markdown preprocessor to avoid link node parsing (#11888)
Closes: [BS-3282](https://linear.app/affine-design/issue/BS-3282/预处理-footnote-definition-中的-url-避免-markdown-link-node-parsing)
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Closes: [BS-3282](https://linear.app/affine-design/issue/BS-3282/预处理-footnote-definition-中的-url-避免-markdown-link-node-parsing)