fix(img): draggable attribute is now inherited to inner img element

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

The draggable attribute does not get applied to the inner img tag within ion-img.

Issue URL: Resolves #21325

What is the new behavior?

The draggable attribute will be reflected to the inner img tag within ion-img.

• Setting draggable="true" will allow the image to be draggable
• Setting draggable="false" will disable the image from being draggable.
• Not setting draggable will result in the default browser behavior of the image being draggable.

Does this introduce a breaking change?

• Yes
• No

Other information

This PR is in favor of #21686. Co-author credit has been applied to the commit.

[liamdebeasi]

I pushed a commit that lets us avoid JSON.parse.