[lexical-playground][lexical-poll] Bug Fix: Fixes undefined context inside Poll add option

[romanWebiya]

When lexical parse PollNode, you get error Cannot get getWritable of undefined.
The reason is that this is equal to undefined because of passing addOption function as an argument.

Test plan

Add a poll to initial state
Get error on init, no poll content inside

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 1, 2024 1:57pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 1, 2024 1:57pm

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[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	28.47 KB (0%)
lexical - esm	28.28 KB (0%)
@lexical/rich-text - cjs	36.86 KB (0%)
@lexical/rich-text - esm	28.08 KB (0%)
@lexical/plain-text - cjs	35.49 KB (0%)
@lexical/plain-text - esm	25.3 KB (0%)
@lexical/react - cjs	38.82 KB (0%)
@lexical/react - esm	29.27 KB (0%)

[ivailop7]

@romanWebiya could you sign the CLA please. Thanks!