[Enabler] [AC tool] Add more options when testing with the AC tool (#1827)

* Change flag used to run specific test

* Add more env vars needed to run tests

* Add verbose option to ac_test

* Add mark and stop options to ac_test

* Refactor pytest call

Also changes how verbosity is handled, as well as adds printing of each pytest command run.

* Update config to support new way of handling env vars in tests

* Add profile option to ac_lint

* Add support to run multiple files in ac_test

* Change boolean options to flags

Options `debug` (ac_test, test_concurrent) and `stop` (ac_test) can be now used simply as flags, without the need to add a `"true"` string after the option.

* Document and clean up arg parser

* Update more boolean options to be flags

* Refactor pytest call

* Add option 'volumes' to ac_test

* Add user option and tweak verbosity

* Add ac-test-required command

* Add changelog fragment

Author: rexemin