test: Azure AI Search - add unit tests

[anakin87]

Related Issues

• part of https://github.com/deepset-ai/haystack-private/issues/275

Proposed Changes:

• add unit tests for Azure AI Search, focusing on uncovered code paths

How did you test it?

CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[github-actions]

Coverage report (azure_ai_search)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/azure_ai_search/src/haystack_integrations/components/retrievers/azure_ai_search
bm25_retriever.py
embedding_retriever.py
hybrid_retriever.py
integrations/azure_ai_search/src/haystack_integrations/document_stores/azure_ai_search
document_store.py
filters.py
Project Total

This report was generated by python-coverage-comment-action

[sjrl]

Looks good!