[lexical-table] Bug Fix: Fix scrollable table exportDOM

[etrepum]

Description

Fix TableNode.exportDOM regression when using scrollable tables

Closes #6882

Test plan

I don't have time to do unit tests right now but this fixes it, if you wanted to release ASAP.

Before

Insert relevant screenshots/recordings/automated-tests

After

Insert relevant screenshots/recordings/automated-tests

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 29, 2024 3:45am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 29, 2024 3:45am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	30.92 KB (0%)
lexical - esm	30.83 KB (0%)
@lexical/rich-text - cjs	39.73 KB (0%)
@lexical/rich-text - esm	32.65 KB (0%)
@lexical/plain-text - cjs	38.32 KB (0%)
@lexical/plain-text - esm	29.93 KB (0%)
@lexical/react - cjs	41.46 KB (0%)
@lexical/react - esm	34 KB (0%)

[etrepum]

The reason for this regression is because the exportDOM machinery ($appendNodesToHTML) doesn't currently have any support for getDOMSlot so the children ended up in the scrollable div instead of the table node since the result of createDOM was used directly as the element.