Rename rehydrate

[Andarist]

I've extracted this from #1876 as this part of the change is way less controversial and shouldn't be blocked by the discussion about the rest of the stuff in that PR.

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This PR includes changesets to release 6 packages

Name	Type
@emotion/sheet	Patch
@emotion/cache	Patch
@emotion/css	Patch
@emotion/react	Patch
@emotion/jest	Patch
@emotion/server	Patch

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[Andarist]

I think this is not controversial at all, so I'm just going ahead and merging this. Feel free to leave the review comments at any time though.

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[emmatown]

Should be a major

[Andarist]

Technically in a regular situation - yes, this kind of a change should be a major. Ive deliberetely made it patch because this method was only added within current prerelease cycle so technically this is not a breaking change for v10 users.

I will be removing this changeset and changing the original one before landing v11 so no mention of rehydrate will be included in the final v11 changelogs.

Also - as I plan to remove this particular changeset i didnt want to trigger too high bump in the current prerelease cycle as removing it later would cause a final version to be downgraded (in comparison to one of released prereleases) and this would only cause confusion and potentially be a problem later.