fix: improve node and mark copy-paste behavior

[elzody]

📝 Summary

Resolves #5650, #5480

This PR introduces better handling for various copy-paste situations which present issues. Namely, it resolves all of the following issues with copy-pasting:

• Copying from a code block should just paste the code in question
• Copying multiple list items should result in something that resembles a list
• Copying version numbers should not result in an escaped character (28\.0.3 e.g.)
• Copying a larger fragment of a doc should result in markdown as this can be useful for creating github issues
• Copying an address from inside a info block should only result in the address
• Copy two paragraphs of text with bold, italic, etc formatting into the Signal Desktop Client or the text-only body field of your mail client
• Copy a list of email address links that spans over several blocks (e.g. [mail@example.org](mailto:mail@example.org)\n\n[mail2@example.org](mailto:mail2@example.org) into the recipient field of any mail client (Thunderbird, Roundcube)

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests

[max-nextcloud]

/backport to stable29

[max-nextcloud]

/backport to stable28

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