[uninstall] deb package leaves files behind even with --purge

[leehinman]

If elastic-agent package is uninstalled with:

systemctl stop elastic-agent && apt-get -y -q purge elastic-agent

files are still left on the file system including:

/etc/elastic-agent
/etc/elastic-agent/elastic-agent.yml.2024-02-14T15-59-46.9261.bak
/etc/elastic-agent/fleet.enc
/etc/elastic-agent/fleet.enc.lock
/etc/elastic-agent/vault
/etc/elastic-agent/vault/ce5cae1525529517af95d07e1bf467e4c2971a9e80178b37178eade8754c5121
/etc/elastic-agent/vault/.lock
/etc/elastic-agent/vault/.seed
/usr/share/elastic-agent
/usr/share/elastic-agent/bin
/usr/share/elastic-agent/bin/elastic-agent
/var/lib/elastic-agent
/var/lib/elastic-agent/data
/var/lib/elastic-agent/data/agent.lock
/var/lib/elastic-agent/data/elastic-agent-ca4d78
/var/lib/elastic-agent/data/elastic-agent-ca4d78/logs
/var/lib/elastic-agent/data/elastic-agent-ca4d78/logs/elastic-agent-20240214-1.ndjson
/var/lib/elastic-agent/data/elastic-agent-ca4d78/logs/elastic-agent-20240214.ndjson
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/beat
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/beat/metrics-monitoring
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/beat/metrics-monitoring/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring/registry
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring/registry/filebeat
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring/registry/filebeat/log.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/filestream-monitoring/registry/filebeat/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/http
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/http/metrics-monitoring
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/http/metrics-monitoring/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default/registry
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default/registry/filebeat
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default/registry/filebeat/log.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/log-default/registry/filebeat/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/system
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/system/metrics-default
/var/lib/elastic-agent/data/elastic-agent-ca4d78/run/system/metrics-default/meta.json
/var/lib/elastic-agent/data/elastic-agent-ca4d78/state.enc
/var/lib/elastic-agent/data/tmp
/var/log/elastic-agent
/var/log/elastic-agent/elastic-agent-20240214-1.ndjson
/var/log/elastic-agent/elastic-agent-20240214.ndjson

The use of purge should remove the files, if uninstall had been used it would be acceptable for the configuration files to remain.

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)