Previously, we forgot to add `depth: 0` to our `findGlobal` call in `getEntityPolicies`. This PR adds `depth: 0` which will be faster.
It also cleans up the `getEntityPolicies` function in general by adding missing types, JSDocs and improving code readability.
This was part of https://github.com/payloadcms/payload/pull/11236 and has been extracted into this separate PR, to make it easier to review
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