gutenberg PR: WordPress/gutenberg#31083

To test:

For testing this, manual code changes are required to test different text sizes. I tested this by modifying the text of the notice that is triggered when copying a block:

1. Go to this line
2. Change the text (it would be nice to test with different text sizes like 2/3/4 lines)
3. Select any block
4. Tap on the three dots button to open the block actions menu
5. Tap on "Copy block" (this will display a notice)
6. Observe that the content of the notice is displayed properly

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.