add ability to add / update run_managed env
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Issue body
### 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
https://github.com/canonical/craft-application/blob/50cb666f911a139044d046179b53eb49bbd7644d/craft_application/application.py#L425-L428
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