SearchKit - Improve performance of checking link permissions

[colemanw]

Overview

Speeds up search display performance by checking link permissions more efficiently.

Before

Link permissions checked one-at-a-time, resulting in hundreds of internal calls to the checkAccess api per request.

After

Gatekeeper permissions checked once in bulk. Fine-grained ACLs checked without the overhead of the api wrapper. Test coverage added to make sure it still works.

@eileenmcnaughton

[civibot]

Thank you for contributing to CiviCRM! ❤️ We will need to test and review the PR. 👷

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[eileenmcnaughton]

Seems to work fine