Delete no model tests

[wanliAlex]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Delete no model tests as they are not supported in the Triton release

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Note

Low Risk
Low functional risk since this only removes test coverage and test-index fixtures for the unsupported no_model setup. The main risk is reduced regression coverage if no_model support returns or was still relied on in some environments.

Overview
Removes the no_model-based test index from cloud test fixtures by deleting CloudTestIndex.unstructured_no_model and its settings mapping.

Updates the shared MarqoTestCase test-index setup to stop creating/using the unstructured no_model index, and deletes the test_no_model_custom_vector_doc coverage in test_add_documents.py.

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