Add test environment without optional deps

We can follow the DRF example on splitting up tests without having optional dependencies installed.

For this to work we properly need to compat imports as in DRF.

This way we ensure that DJA actually works without the optional deps installed.

As we removed django polymorphic support in main (#1336), only django-filter remains as an optional dependency.

As the django-filter DJA integration is in an entire own module it can not interfere if not imported. Therefore this issue becomes obsolete. Closing.

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