Differentiate 'Copy' and 'Copy styles' snackbar confirmation messages

[afercia]

Description

WHen copying a block and when copying a block styles, a snackbar notice appears with a confirmation message. The confirmation message text is the same in both cases:

`Copied {block name} to clipboard'

when copying styles of multiple blocks:

'Copied {n} blocks to clipboard'

For better clarity and better user experience, the copy stiles operation should use its own confirmation message, something along the lines of:

`Copied block styles to clipboard' and 'Copied {n} blocks styles to clipboard'

Step-by-step reproduction instructions

• Go to the post editor and select a paragraph.
• Frorm the block toolbar > Options dropdown menu, click 'Copy' and then click 'Copy styles'.
• Observe two snackbar notices appear with the same text.

Screenshots, screen recording, code snippet

Snackbars notices with the same text after 'Copy' and then click 'Copy styles':

Copy styles with multiple block selected:

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[t-hamano]

Actually, copying styles is internally the same as copying the block itself 😅 Therefore, I proposed in #55611 to remove the "Copy Styles" action itself.

[richtabor]

Actually, copying styles is internally the same as copying the block itself 😅 Therefore, I proposed in #55611 to remove the "Copy Styles" action itself.

If we remove copy styles from the menu, no one will know it's possible.

[richtabor]

For better clarity and better user experience, the copy stiles operation should use its own confirmation message, something along the lines of:

`Copied block styles to clipboard' and 'Copied {n} blocks styles to clipboard'

You can't actually copy styles of more than one block. It's limited to one at a time.

[richtabor]

For better clarity and better user experience, the copy stiles operation should use its own confirmation message, something along the lines of:

I think it'll be nice having a more relevant message, even simpler and more direct: "Styles copied to clipboard."