feat(weaviate): add tenant support in write_documents with tests (syn…

[Akash504-ai]

Related Issues

• fixes Weaviate: Consider Adding support for multi tenancy #472

Proposed Changes

• Added tenant support to write_documents and write_documents_async
• Updated internal batch write logic to pass tenant parameter correctly
• Enables basic multi-tenancy support for Weaviate document store
• Added tests for tenant support in:
  • sync document store
  • async document store

How did you test it?

• Added integration tests for:
  • test_write_documents_with_tenant
  • test_write_documents_with_tenant_async
• Verified no regression in default (non-tenant) behavior
• Did not run full Weaviate integration locally, relying on CI for validation

Notes for the reviewer

• Changes are minimal and focused on tenant support in write operations
• Both sync and async flows are covered
• Backward compatible (no tenant → existing behavior unchanged)

Checklist

• I have read the contributors guidelines and code of conduct
• I have updated the related issue
• I added tests
• I used a conventional commit message

[CLAassistant]

All committers have signed the CLA.