add-noreferrer-quick-fix shouldn't add duplicated rel attribute

[jasonlyu123]

Describe the bug

add-noreferrer-quic-fix adds another rel attribute when there is already a rel attribute.

Reproduction

<a target="_blank" rel="noopener">test</a>

Expected behaviour

add the value to the existing rel attribute.

System Info

• OS: Windows
• IDE: VSCode

Which package is the issue about?

None

Additional Information, eg. Screenshots

No response

[cooolbros]

Yes I can reproduce this, I will see if I can come up with a fix