fix: insert value behaviour

[Balastrong]

This PR closes #696

As mentioned on Discord, this should be the expected behavior of "inserting a value into an array".

[nx-cloud[bot]]

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[crutchcorn]

I think this is correct. Can we add in a new replaceFieldValue to act like the old insertFieldValue API? I'm more than happy to merge if we're able to add that + some minor tests :)

[crutchcorn]

NxCloud is having errors, but pnpm test:ci works locally and I have high confidence in these changes. Merging!