Refactor `tenants` to use gRPC methods for `get` operations

[tsmith023]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 22 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (dev/1.25@22b78a9). Click here to learn what that means.

Files	Patch %	Lines
weaviate/collections/grpc/tenants.py	80.00%	5 Missing :warning:
weaviate/collections/tenants.py	86.48%	5 Missing :warning:
integration/test_tenants.py	88.46%	3 Missing :warning:
integration_v3/test_backup_v4.py	25.00%	3 Missing :warning:
weaviate/backup/backup.py	50.00%	2 Missing :warning:
weaviate/collections/collections.py	33.33%	2 Missing :warning:
weaviate/exceptions.py	50.00%	1 Missing :warning:
weaviate/util.py	83.33%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             dev/1.25    #1031   +/-   ##
===========================================
  Coverage            ?   94.96%           
===========================================
  Files               ?      176           
  Lines               ?    18096           
  Branches            ?        0           
===========================================
  Hits                ?    17184           
  Misses              ?      912           
  Partials            ?        0           

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