fix(link): fix links autolinking when not needed

[bdbch]

Please describe your changes

This PR changes the autolink behavior. Before links were always autolinked, even when the autolinked text was already a link. This is weird behavior - as a manually / already set link should always have priority over automatically linked content.

Example:

You have a link that has the textContent mysite.com but a link mark with a href attr to https://mysite.com?ref=my-referral-id the autolink prior to this PR would still autolink to mysite.com completely removing any manually set attributes.

How did you accomplish your changes

Right before the autolink would set the link mark on words with spaces/breaks I added a check to see if the link.from and link.to already has a link mark inbetween. If so we just avoid autolinking to keep the already existing link.

How have you tested your changes

• Local link demo

How can we verify your changes

1. Check out this PR
2. Open the Link demo
3. Paste links / set links manually with urls as a textcontent and run autolinking on them.

Checklist

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

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