Use a unique name for each agent started using the systemd template unit file #2205
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Relates to buildkite/docs#2252.
The docs currently advise users that they can run multiple agents using the same configuration by using the systemd template unit file.
However, this results in starting multiple agents with the same name, which the configuration docs advise against doing.
This PR uses unit file specifiers to give each agent a unique name based on the hostname and the systemd service instance name.