[6.13.z] Remove nailgun entity_mixin import from discovery tests #15246
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Cherrypick of PR: #15164
Problem Statement
Remove nailgun entity_mixin import from discovery tests, and replace entity_mixins.DEFAULT_SERVER_CONFIG
Solution
Replacing entity_mixins.DEFAULT_SERVER_CONFIG with new default_nailgun_config method, which is same as existing user_nailgun_config method
And, we don't have any automated tests under this module, verifying default_nailgun_config() method in #15163