[lexical] Bug Fix: delete line for selections ending with elements

[DraXu3]

Description

This PR fixes line deletion operation via CMD (⌘) + Backspace combination on MacOS for cases when the current selection has an anchor of type element.

This is an extension of this PR which originally limited line deletion for text based selections only.

Closes: #6047

Test plan

1. Open https://playground.lexical.dev/
2. Type some text and then insert a sample image or any other element
3. Press "CMD (⌘) + Backspace"
4. Observe that the whole line is deleted

Before

1.mov

After

2.mov

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 22, 2024 6:42pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 22, 2024 6:42pm

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/lexical/dist/Lexical.js	23.93 KB (0%)	479 ms (0%)	459 ms (+16.68% 🔺)	937 ms
packages/lexical-rich-text/dist/LexicalRichText.js	34.59 KB (0%)	692 ms (0%)	1.3 s (+19.83% 🔺)	2 s
packages/lexical-plain-text/dist/LexicalPlainText.js	34.59 KB (0%)	692 ms (0%)	1.1 s (+11.26% 🔺)	1.8 s

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