fix(link): Fix autolinking and pasting

[bdbch]

Please describe your changes

This PR will fix multiple issues with the current auto linking.

• First fix is that pasteOnLink option was not working anymore
• I'll also fix an apparent issue that content after a pasted link is also autolinked? (wasn't able to reproduce for now)

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

fixes #4256
fixes #4258

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[rfgamaral]

@bdbch The docs for the linkOnPaste option say:

Adds a link to the current selection if the pasted content only contains an url.

But I don't think this is quite true...

Take the link editor example and paste something like [tiptap](https://tiptap.dev). You can see that https://tiptap.dev will be converted into a link, but the pasted content does not only contain a URL, it contains more than that.

This became a problem for us because we have Markdown support on our editor, and we have our own paste rules to handle the Markdown syntax. However, this new linkOnPaste option (default: true) caused us an issue by auto-linking when it shouldn't (based on my interpretation of the documentation).

As a workaround, we are setting linkOnPaste to false, and this seems to fix everything for us, but I'm wondering if this shouldn't be fixed in Tiptap itself? Although Tiptap does not support Markdown, I don't think the link found in [tiptap](https://tiptap.dev) should be auto-linked.

Here's another example of a similar situation where auto-linking shouldn't have worked:

What do you think?