Enforce max 20 attributes to a project limit

Gal Katzrequested to merge
gkatz_enforce_20_attributes_per_project into master

What does this MR do and why?

Enforce max 20 attributes per project limit when attaching and detaching attributes.

Changelog: added
EE: true

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Related to Add 20 attributes limit for project (#567567 - closed) • Gal Katz • 18.5

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