remove unstable_batchedUpdates

[TkDodo]

context

we currently use unstable_batchedUpdates as our batchNotifyFn in React and React Native:

query/packages/react-query/src/setBatchUpdatesFn.ts

Line 4 in 357ec04

notifyManager.setBatchNotifyFunction(unstable_batchedUpdates)

Apparently, this function is a "noop" in React18, as discussed here:

facebook/react#24831 (comment)

proposal

• remove the default side-effect that sets batchedUpdates
• keep the option to set a batchUpdatesFn via the notifyManager
• this would also mean we would be completely side-effect free:

query/packages/react-query/package.json

Lines 24 to 26 in 9b21609

	"sideEffects": [
	"./src/setBatchUpdatesFn.ts"
	],