add ability to add / update run_managed env

[dariuszd21]

What needs to get done

Add _extra_managed_env() method to the application that will be used to update the mentioned dict before command is run

Why it needs to get done

Current implementation have a hardcoded set of environmental variables to be passed to managed run. We need an ability to pass it on the application basis

craft-application/craft_application/application.py

Lines 425 to 428 in 50cb666

	env = {
	"CRAFT_PLATFORM": build_info.platform,
	"CRAFT_VERBOSITY_LEVEL": craft_cli.emit.get_mode().name,
	}

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3740.

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