send message when giving up on join attempt #60110
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This PR adds a GivingUp message that joining clients (hosts or bots) will send when they give up on a join attempt due to some error. This should help when debugging hosts or bots that are failing to join a cluster, as they are now able to send context about why they are failing to the auth server, which will include that message in a log message and audit event. This was prompted by Edoardo's comment on RFD 27e here https://github.com/gravitational/teleport.e/pull/6963#discussion_r2250796633