Inline diff actions should use singular when a single line is deleted

[egamma]

Testing #79833

When a single line is deleted:

Then the label should be 'Copy deleted line content to the clipboard'

[chrisdias]

I think the word "content" is not necessary...

"Copy deleted line (xx) to the clipboard"
"Copy deleted lines to the clipboard"

[egamma]

see also #79879

[rebornix]

Fixed via 7449c80 . Took suggestion from #79879 (comment) . Thanks for all the suggestions.