Don't check org quota visibility if user reads globally

[will-gant]

• A short explanation of the proposed change:

Adopts the approach taken in #2650 and #2638 to eliminate the need for DB queries in the org quotas presenter when the user is a global reader.

• An explanation of the use cases your change solves

This noticeably speeds up GET /v3/organization_quotas for global readers, which currently drags when constructing the relationships block of each response object. On foundations with thousands of orgs constructing the relationships block currently take a very long time (I measured an average of 117 seconds on one foundation with 65,000 orgs, and that's with per_page=50 (versus 0.035 seconds for the equivalent v2 endpoint)). Currently, a separate DB query is made for each org that org quotas have a relationship with in order to determine whether it is visible to the user - even when we know the user is a global reader.

This change skips these expensive queries for users with an admin, admin read-only or global auditor role, and in a test environment with 20,000 orgs, each assigned its own org quota, /v3/organization_quotas?per_page=50 now takes 0.533 seconds.

• I have reviewed the contributing guide

• I have viewed, signed, and submitted the Contributor License Agreement

• I have made this pull request to the main branch

• I have run all the unit tests using bundle exec rake

• I have run CF Acceptance Tests

[philippthun]

Oh, spec/request/organization_quotas_spec.rb also checks the error message and needs to be adapted.