Add verbosity level

[LaserPhaser]

Add verbosity level to report pytest details to the slack channel.
Verbosity level must be added as an options (--slack_verbose=[1...3])
Levels:

1. only red/green label
2. Added cookiecutter based update #1 + number of failed/passsed/skipped/errored tests
3. Initial Update #2 + default pytests output as attachment

[vlad-stack]

Some extra details about failed tests definitely should be helpful