Deprecate use of legacy filters syntax in Document Stores integrations

[silvanocerza]

The legacy filters syntax from Haystack 1 must be deprecated in favour of the new one.

As of now if the legacy syntax is used we automatically convert it internally to the new one.
We should emit a deprecation warning instead.

After that is done we can also remove some utility classes in testing used to test Document Stores.

These are the integration that must be updated.

Tasks

Beta Give feedback

1. Deprecate use of legacy filters syntax in Astra Document Store integration #875
   +0
   
2. Deprecate use of legacy filters syntax in Chroma Document Store integration #876
   +0
3. Deprecate use of legacy filters syntax in Elasticsearch Document Store integration #877
   +0
   
4. Deprecate use of legacy filters syntax in mongodb_atlas Document Store integration #878
   +0
5. Deprecate use of legacy filters syntax in OpenSearch Document Store integration #879
   +0
   
6. Deprecate use of legacy filters syntax in pgvector Document Store integration #880
   +0
7. Deprecate use of legacy filters syntax in pinecone Document Store integration #881
   +0
8. Deprecate use of legacy filters syntax in qdrant Document Store integration #882
   +0
   
9. Deprecate use of legacy filters syntax in weaviate Document Store integration #883
   +0
10. Remove some utility classes in testing used to test legacy filter syntax in Document Stores. haystack#8023
    P1 +1

See also deepset-ai/haystack#7893