Astra document store filter tests are skipped

[shadeMe]

Describe the bug
The tests in the Astra core integration override the common document store/filters test suite and mark them for skipping. We need to remove those overrides to ensure that we fully test the integrations supported filters.

[vblagoje]

Currently on hold due to missing operations in Astra. See #1000 for more details.

[julian-risch]

Let's move this issue back to the backlog as it's not a high priority right now.