Prune old expired intermediate certs when appending a new one #14429
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This PR adds some CA logic to prune old expired intermediate certs from the active root when a new intermediate is fetched. Since we renew the intermediate 1/3-1/2 of the way through its lifetime, this means there should never be more than a few old intermediates left around the root CA regardless of the configured root cert TTL.
Fixes #14159