Add flag to target either active or standby production environment

[nicksantamaria]

Is your feature request related to a problem? Please describe.

Currently when a project uses active/standby deployments, it is up to the user to know or look up which environment is active before running commands.

Describe the solution you'd like

For all commands that accept the --environment flag, add a new optional --production flag to target the active/standby environment for a project. eg

lagoon ssh \
  --project=foo \
  --production=active

# Opens a ssh session on foo-prod-left

Describe alternatives you've considered

If there was another lagoon command which showed the active/standby status you could potentially subshell output from that command into the --environment flag. eg

# Hypothetical active/standby output from list environments command
$ lagoon list environments --project foo
ID    	NAME      	DEPLOYTYPE 	ENVIRONMENT	OPENSHIFTPROJECTNAME  	ROUTE			STATUS
xxxxx	prod-left 	branch     	production 	foo-prod-left   	https://www.foo.com	active
xxxxx	prod-right	branch     	production 	foo-prod-right		https://standby.foo.com	standby

# Hypothetically use subshell to inject that into another command
lagoon ssh \
  --project foo \
  --environment $(lagoon list environments --project foo | grep active | awk '{print $2}')

alas this feature does not exist yet.