Backport of consul: handle "not found" errors from Consul when deleting tokens into release/1.4.x #17849
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Backport
This PR is auto-generated from #17847 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
In Consul 1.15.0, the Delete Token API was changed so as to return an error when deleting a non-existent ACL token. This means that if Nomad successfully deletes the token but fails to persist that fact, it will get stuck trying to delete a non-existent token forever.
Update the token deletion function to ignore "not found" errors and treat them as successful deletions.
Fixes: #17833
Source for text of error (there's no const in the
apipackage for it): https://github.com/hashicorp/consul/blob/api/v1.22.0/agent/acl_endpoint.go#L470