avro: Handle int64 values correctly [Backport to 4.2]

[cosmo0920]

Backporting of #11883.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Propagate integer conversion failures from arrays

When this new range check fires for an element inside an Avro array, msgpack2avro does not stop or preserve the failure in the array case: it appends the element, sets ret to FLB_FALSE, then continues and can overwrite ret with a later successful element. For an int array such as [2147483648, 1], flb_msgpack_to_avro can return success even though the first element could not be assigned, so the encoder may emit a record with an unset/defaulted array element instead of rejecting the invalid input.

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