Fix onPaste handling in link extension in rc.4

[svenadlung]

Please describe your changes

The link extension mistakenly inserted pasted content at wrong position in rc-4

tiptap/packages/extension-link/src/helpers/pasteHandler.ts

Line 74 in 0e2df9d

tr.insert(currentPos - 1, node)

This handling was originally reserved for links and not for other types.
A check has been introduced that dispatches the transaction only for pasting links.

It also prevents processing links in onPaste in code blocks.

How did you accomplish your changes

Added a condition to only dispatch insert transaction if pasted content is a link fragment.

How have you tested your changes

• Copy and paste any type of content (e.g. text). In RC-4 it got inserted at position -1. This should be fixed now.
• Paste this into a code block: <a href="https://www.google.com">Google</a>

How can we verify your changes

See above and below.

Before:
https://github.com/ueberdosis/tiptap/assets/11420688/6bcc45a6-c226-4859-a1b4-74387d271692

After:
https://github.com/ueberdosis/tiptap/assets/11420688/7da50487-7f54-4d19-b0a3-00c2bb29a5be

Remarks

Still feels like there is some room for optimizations regarding pasting links.

Checklist

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

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