Fix the basic cluster system tests that cannot be executed without modifications

[pro-akim]

Description

The basic cluster tests need to be reviewed, as after the execution of certain tests, the environment becomes messy, causing subsequent failures

Current behavior

False failures occur when the tests are being executed.
Therefore it should be executed in the following order and steps:

part 1
test_cluster/test_agent_key_polling/test_agent_key_polling.py
test_multigroups/test_multigroups.py

part 2
test_cluster/test_agent_files_deletion/test_agent_files_deletion.py
test_cluster/test_agent_groups/test_agent_groups_forced_change.py

part 3
test_cluster/test_agent_info_sync/agent_info_sync

Expected behavior

The environment should be cleaned and restarted between tests in order to be able to execute them without additional maneuvers.

[juliamagan]

Development branch
bug/4617-clean-system-env

Changes applied and tests passed, it remains to open the PR.

[juliamagan]

Update

Finally I had to spend more time on this issue, because I wanted not only to be able to launch all tests at the same time without being affected, but also to be able to launch several rounds without having to destroy the environment in between.

[pro-akim]

Update

Evidence of the test will be awaited. Moved to on hold.

[pro-akim]

Review Notes

Local tests worked OK.
LGTM