test!: remove global registration of pytest plugins

Instead a conftest.py close to the test files needs
to opt into using plugin hooks and fixtures.

also remove some packaging leftover with initenv.sh

cmdeploy/src/cmdeploy/__init__.py

@@ -0,0 +1 @@
+

cmdeploy/src/cmdeploy/tests/conftest.py

@@ -1,9 +1,11 @@
 """Run the lua scripts we ship under lupa, which bundles Lua 5.4 like dovecot."""
 
 import pytest
+from chatmaild.tests.plugin import *  # noqa: F403
 from lupa import lua54
 
 from cmdeploy.basedeploy import get_resource
+from cmdeploy.tests.plugin import *  # noqa: F403
 
 
 class Lua: