fix: false positives in no-reversed-media-syntax

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Which language are you using?

CommonMark and GFM.

What did you do?

I expected no-reversed-media-syntax not to report occurrences inside Image, ImageReference, or LinkReference, but it does.

Image, ImageReference, and LinkReference are nodes where a Link node using the []() syntax cannot appear, so these are false positives.

What did you expect to happen?

I expect no false positives to occur in Image, ImageReference, or LinkReference nodes.

Link to minimal reproducible Example

The following Markdown code may help identify the problem:

<!-- eslint markdown/no-reversed-media-syntax: "error" -->

<!-- Image -->
![()[]](hi)
![(hi)[something]](hi)
![()[]](https://example.com)

<!-- ImageReference -->

![()[]][ref]
![(hi)[something]]

<!-- LinkReference -->

[()[]][ref]
[(hi)[something]][ref]

<!-- ---------------------- -->

[ref]: https://example.com

What changes did you make? (Give an overview)

In this PR, I've fixed false positives in no-reversed-media-syntax rule.

Image, ImageReference, and LinkReference are nodes where a Link node using the []() syntax cannot appear, so these are false positives.

Related Issues

N/A

Is there anything you'd like reviewers to focus on?

N/A

[lumirlumir]

This test case isn't related to this change, but the test for the Image node within a FootnoteReference node was missing, so I've added one.

[mdjermanovic]

LGTM, thanks!