Multivector backwards compatibility test

[nathanwilk7]

The point of this PR is to verify the behavior of Weaviate when rolling back after creating multivectors.

This PR adds a test which does the following for a couple past versions of Weaviate (1.26 - 1.29):

1. Using the "current" version of Weaviate, creates one normal vector collection, one multivector collection, and one collection with both normal and multivectors.
2. Ingest data into both collections.
3. Restart Weaviate with the old version.
4. Verify the support of the old version for multivectors by querying the relevant collections (note that some old versions fully support multivectors, some drop them, and some do not support them at all).
5. Restart Weaviate with the "current" version and verify the queries work.

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
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Passed	Vulnerabilities	0   0   0   0	View in Orca

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	NAME	FILE
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[nathanwilk7]

On version 1.24.26, I get the error:

# Traceback (most recent call last):
#   File "/workdir/verify_multivectors.py", line 43, in <module>
#     assert len(normal_objects.objects) == 1, f"Expected 1 object in {NORMAL_VECTOR_COLLECTION_NAME}, got {len(normal_objects.objects)}"
#            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# AssertionError: Expected 1 object in Normalvector, got 0

[nathanwilk7]

On version 1.25.29, I get the error:

# Traceback (most recent call last):
#   File "/workdir/verify_multivectors.py", line 71, in <module>
#     normal_results = normal_collection.query.near_vector(
#                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/site-packages/weaviate/syncify.py", line 23, in sync_method
#     return _EventLoopSingleton.get_instance().run_until_complete(
#            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/site-packages/weaviate/event_loop.py", line 42, in run_until_complete
#     return fut.result()
#            ^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/concurrent/futures/_base.py", line 456, in result
#     return self.__get_result()
#            ^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/concurrent/futures/_base.py", line 401, in __get_result
#     raise self._exception
#   File "/usr/local/lib/python3.11/site-packages/weaviate/collections/queries/near_vector/query.py", line 92, in near_vector
#     res = await self._query.near_vector(
#                 ^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/site-packages/weaviate/collections/grpc/query.py", line 248, in near_vector
#     near_vector=self._parse_near_vector(
#                 ^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/site-packages/weaviate/collections/grpc/shared.py", line 376, in _parse_near_vector
#     vector_per_target_tmp, near_vector_grpc = self._vector_per_target(
#                                               ^^^^^^^^^^^^^^^^^^^^^^^^
#   File "/usr/local/lib/python3.11/site-packages/weaviate/collections/grpc/shared.py", line 129, in _vector_per_target
#     raise WeaviateInvalidInputError(
# weaviate.exceptions.WeaviateInvalidInputError: Invalid input provided: The number of target vectors must be equal to the number of vectors..