fix(arrow/array): avoid copying initialized extension refcounts - #1089
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Rationale for this change
The extension array constructor initializes the base reference count and then copies the complete value through reflection. That can copy an atomic after first use and triggers the copylocks vet warning.
What changes are included in this PR?
Allocate the concrete extension array first and initialize its embedded ExtensionArrayBase directly in the destination.
Are these changes tested?
go test ./arrow/arrayAre there any user-facing changes?
No API changes. This corrects the reported behavior while preserving the existing ownership and compatibility contracts.