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

[karthick-murugan]

What?

Fixes #57254

Differentiates snackbar confirmation messages for "Copy" and "Copy styles" operations.

Why?

Currently, the snackbar messages for both "Copy" and "Copy styles" operations display the same text, causing confusion for users. This update introduces distinct messages to improve clarity and the user experience.

How?

• Updated snackbar messages for "Copy" and "Copy styles" actions.
• Implemented conditional logic to display appropriate messages depending on the action performed.

Testing Instructions

1. Open the post editor and add a block.
2. Use the "Copy" option from the block toolbar and verify the snackbar displays: Copied "%s" to clipboard.
3. Use the "Copy styles" option from the block toolbar and verify the snackbar displays: Styles copied to clipboard.
4. Ensure both actions work correctly using keyboard navigation.

Video

REC-20241220125454.mp4

[github-actions]

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Co-authored-by: karthick-murugan <[email protected]>
Co-authored-by: t-hamano <[email protected]>
Co-authored-by: richtabor <[email protected]>
Co-authored-by: afercia <[email protected]>

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[karthick-murugan]

@afercia - Please have a look at this PR when you get some time.

[afercia]

Looks good to me, thanks