[Feature suggestion] Add copy capability for "text-like" attachments

Hello,

This is a feature suggestion that I think might be helpful, especially given the fact that you added a "copy" button for the test steps properties:

Similarly to the "Copy" button highlighted in red in the above screenshot, add the same capability for "text-like" attachments that would help to quickly copy the text from the attachment (in this example, it would copy the JSON as text).

Thanks for considering it!