keyring: fix missing GC config, don't rotate on manual GC #15009
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For #14981
The configuration knobs for root keyring garbage collection are present in the consumer and present in the user-facing config, but we missed the spot where we copy from one to the other. Fix this so that users can set their own thresholds.
The root key is automatically rotated every ~30d, but the function that does both rotation and key GC was wired up such that
nomad system gc
caused an unexpected key rotation. Split this into two functions so thatnomad system gc
cleans up old keys without forcing a rotation, which will be done periodically or by thenomad operator root keyring rotate
command.