[lexical-playground] Bug Fix: fix comment timestamps

[irahopkinson]

Description

When adding collaborative comments in the playground, the comment timestamps are now consistent even in different window contexts.

Closes #6554

Test plan

Follow the reproduction steps in issue #6554 and see that the comment timestamps are now the same.

Before

Comment timestamps are inconsistent in different window contexts.

After

Comment timestamps are the same in different window contexts.

Note

There are other uses of performance.now() in this repo that might need to be reviewed.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 26, 2024 2:35am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 26, 2024 2:35am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.38 KB (0%)
lexical - esm	29.24 KB (0%)
@lexical/rich-text - cjs	37.89 KB (0%)
@lexical/rich-text - esm	31.07 KB (0%)
@lexical/plain-text - cjs	36.49 KB (0%)
@lexical/plain-text - esm	28.41 KB (0%)
@lexical/react - cjs	39.61 KB (0%)
@lexical/react - esm	32.52 KB (0%)

[etrepum]

Looks good, thank you!

[etrepum]

I don't think that any of the other performance.now() calls are distributed