test(pyspark): verify the existing backend-specific tests work in streaming mode

[mfatihaktas]

Is your feature request related to a problem?

As described in the meta-issue #8868, our initial understanding is that Spark SQL has the same syntax for both batch and streaming. This is why, anything at the intersection of these two should just work.

Describe the solution you'd like

We need to verify our understanding (stated above) by testing the existing pyspark backend functionality in streaming mode. The first part of this is to verify the pyspark-specific tests under ibis/backends/pyspark/tests/ in streaming mode.

What version of ibis are you running?

8.0.0

What backend(s) are you using, if any?

pyspark

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