Add capability to add a project in service perimeter in dry-run mode #7270

[lcaggio]

WIP PR, need support to fix issue 7270. I need support to implement the 'use_explicit_dry_run_spec' logic needed here.

I will add tests and check them one I implemented the full logic.

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[lcaggio]

I created a new resource to be consistent with other resources where there are 2 separate variables for spec/status configuration.

I am now stuck at setting the 'use_explicit_dry_run_spec' attribute = true on all calls, not as a configurable resource variable.

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