chore(tests): remove unused env-tester files

[mirageoasis]

while reviewing cli-test improvement I worked on I found out that env-tester-admin env-tester-user env-tester-user2 file is no longer needed

#1778

hence, I found out why user-defined option was not working on pytest

Link Link

it says we have to fix pytest.toml to add options in pytest. since it search only root dir in pytest