Support for hidden cubes

[mchlrch]

• Adds flag to the cubes metadata Project.
• Sets the publishGraph in the PublishJob to a .../hidden graph
• Adds the flag to the published cubes metadata (cc:isHiddenCube)

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Latest commit: 440952874528fc121d3ad1541e4789c07354aea0

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.40506% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 80.42%. Comparing base (dd4cba3) to head (4409528). Report is 5 commits behind head on master.

Files	Patch %	Lines
apis/core/lib/domain/cube-projects/create.ts	82.35%	3 Missing :warning:
apis/core/lib/domain/cube-projects/import.ts	70.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1485 +/- ## ========================================== + Coverage 80.36% 80.42% +0.06% ========================================== Files 199 200 +1 Lines 13676 13745 +69 Branches 829 836 +7 ========================================== + Hits 10991 11055 +64 - Misses 2676 2681 +5 Partials 9 9 ```

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[mchlrch]

Where should the flag show up in UI?

[mchlrch]

Please add a test scenario in cli/test/lib/commands/publish.test.ts which checks that publishing a hidden cube writes to the expected graph

I added a unit test here: apis/core/test/domain/job/create.test.ts