Fix test_assign_agent_group_with_enrollment

[juliamagan]

Related issue
#3862

Description

It has been decided that the test will not check if the default group is assigned in the worker before it receives information from the master. However, when applying this change, a race condition was seen where, when assigning a group with enrollment, the client.keys and the groups are synchronized at the same time, so it fails to insert the groups into the database. It has been decided that the test will wait for the Agent-groups send full task to run and then check that the assigned group is as expected.

Deleted

• Deleted check of default group in test_assign_agent_group_with_enrollment

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Testing performed

Tester	Test path	Jenkins	Local	Commit	Notes
@juliamagan (Developer)	test_cluster/test_agent_groups/test_assign_agent_group_with_enrollment.py	🚫 🚫 🚫	🟢 🟢 🟢	6bb6279	Nothing to highlight
@user (Reviewer)		🚫 🚫 🚫	🚫 🚫 🚫		Nothing to highlight