libindex: simplify fetch arena with weak pointers #1578
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Signed-off-by: RTann <rtannenb@redhat.com> rh-pre-commit.version: 2.3.2 rh-pre-commit.check-secrets: ENABLED
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Go 1.24 introduced weak pointers. According to the docs as well as this blog post, weak pointers will greatly simplify the Fetch Arena, as it eliminates the need to manually count references to each layer.
This PR replaces the manual ref counting with weak pointers and
runtime.AddCleanup.