fix(db-mongodb): disable join aggregations in DocumentDB compatibility mode (#13270)

### What?

The PR #12763 added significant improvements for third-party databases
that are compatible with the MongoDB API. While the original PR was
focused on Firestore, other databases like DocumentDB also benefit from
these compatibility features.

In particular, the aggregate JOIN strategy does not work on AWS
DocumentDB and thus needs to be disabled. The current PR aims to provide
this as a sensible default in the `compatibilityOptions` that are
provided by Payload out-of-the-box.

As a bonus, it also fixes a small typo from `compat(a)bility` to
`compat(i)bility`.

### Why?

Because our Payload instance, which is backed by AWS DocumentDB, crashes
upon trying to access any `join` field.

### How?

By adding the existing `useJoinAggregations` with value `false` to the
compatiblity layer. Individual developers can still choose to override
it in their own local config as needed.