Inherit from FilterDocumentsTestWithDataframe in Document Stores tests after Haystack 2.9.0 release

[anakin87]

In deepset-ai/haystack#8684, we isolated the dataframe tests in the Haystack docstore test suite.
This was done in preparation for the eventual deprecation and removal of dataframe field from Haystack Document - see deepset-ai/haystack#8627.

Until a decision is made to proceed with the deprecation process,
after the 2.9.0 release, we should make the Document Stores test suites inherit from FilterDocumentsTestWithDataframe, so that tests on dataframes will keep running.

This can potentially be done in a single PRs since adapting tests does not require new releases.