the Export behavior (renamed from CreatePkg) now provides for stackID as
another input. With this we are able to remove the additional endpoint
/api/v2/packages/stacks/:stack_id/export. It now fits into the
/api/v2/packages/export endpoint as another req body parameter. This also
makes all export functionality in teh same space, encapsulated both in the
endpoint and within the service layer :-).
references: #18646
this ability exports all resources associated with a stack by the same
metadata.name fields as the original application had done it. This can
be used as a means to snapshot the current state of the stack. This can
be used for source control or other means.
closes: #18271
this also extend dry run to provide env refs to it. the refactoring was
to enable that bit. Having the ability to dry run with the env ref entries
means we can dry run the pkg with the env ref values to see the impact before
the application takes place.