Backport of metadata: memoize the parsed build versions into release/1.20.x #22118
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Backport
This PR is auto-generated from #22113 to be assessed for backporting due to the inclusion of the label backport/1.20.
The below text is copied from the body of the original PR.
Description
There will only be a small set of consul build versions that a single consul server will witness. Inside of
metadata.IsConsulServerwe use a very expensive function in thehashicorp/go-versionlibrary to parse these into read-only*version.Versionstructs all over Consul.Memoize these in a package cache map. Likely the thing will only have like 2 keys in it ever over the life of the process.
Overview of commits