revert arguments when call callFunctionOnService to spread variable

[deckyfx]

What, How & Why?

in version 12+, the User function called from the client always sends arguments wrapped in Array,
I compare the code with version 11+ and found out that function callFunction pass the args to next function callFunctionOnService as a single array argument instead of spread arguments

This should resolve #6447

☑️ ToDos

• 📝 Changelog entry
• 📝 Compatibility label is updated or copied from previous entry
• 📝 Update COMPATIBILITY.md
• 🚦 Tests
• 📦 Updated internal package version in consuming package.jsons (if updating internal packages)
• 📱 Check the React Native/other sample apps work if necessary
• 💥 Breaking label has been applied or is not necessary

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[kraenhansen]

Thanks for catching this and providing a PR! Ideally, I would love if we could also add a test to ensure this doesn't regress.

[kraenhansen]

We do seem to have tests for this, so I'll have to look into why they're not failing https://github.com/realm/realm-js/blob/main/integration-tests/tests/src/tests/sync/user.ts#L636-L672

[kraenhansen]

Unfortunately, I wasn't able to pick your change into my branch, but I updated the test and implementation in #6451 and as such I'll close this PR.

You'll be rightfully attributed in the changelog and release notes. Thanks again!

[deckyfx]

np, as long as this issue is resolved, thanks for your attention <3