Improve verbose output of Breeze (#23446)
Improve verbose output of Breeze (#23446)

When you add --verbose or --dry-run options to breeze it will
print the commands it is executing (or is supposed to in dry-run
mode). The output contains environment variables as they
often contain crucial information to execute the command (for
example in docker-compose run commands it contains COMPOSE_FILE
variable which is the list of compose files that are used). This
is done in a fashion that you can copy the whole command and
execute it, but it very unfriendly for visual inspection as
all the variables were printed in one line and in semi-random
order and also the variables contained often all system variables
set by the shell before.

This change keeps the proerty of "we can copy&paste the command
and run it" but it improves the visual aspect of it:

1) each env variable is kept in one line
2) first all system variables are printed and then variables that
   were specifically added for this command
3) variables in each group are sorted alphabetically which helps
   in finding the variable you are looking for when you visually
   inspect the output.
cfei18/incubator-airflow,apache/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow