tox: Remove redundant environment variables

TOX_ENV_NAME and VIRTUAL_ENV are both set by tox by default.

cf. https://github.com/tox-dev/tox/commit/be5373bab

Change-Id: Iee7c6fc0bd33865a8b8d8a8cf101cffd38515c2d
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

tox.ini

@@ -5,13 +5,11 @@ envlist = py310,py313,pep8,samples
 
 [testenv]
 extras = {env:RALLY_EXTRAS:}
-setenv = VIRTUAL_ENV={envdir}
-         LANG=en_US.UTF-8
+setenv = LANG=en_US.UTF-8
          LC_CTYPE="en.US.UTF-8"
          LANGUAGE=en_US:en
          LC_ALL=C
          PYTHONHASHSEED=0
-         TOX_ENV_NAME={envname}
          PYTEST_REPORT = {env:PYTEST_REPORT:{toxinidir}/.test_results/{envname}_report.html}
          TESTS_DIR = "tests/unit"
 allowlist_externals = find
@@ -43,7 +41,6 @@ passenv =
     HOME
 
 [testenv:zuul-ansible-lint]
-setenv = VIRTUAL_ENV={envdir}
 distribute = false
 deps = ansible-lint
 commands = ansible-lint --strict --config-file tests/ci/playbooks/.ansible-lint tests/ci/playbooks