feat: add default_headers for azure embeddings

[nuernber]

Related Issues

• fixes Support default_headers for AzureOpenAIDocumentEmbedder and AzureOpenAITextEmbedder #8534

Proposed Changes:

Follows the logic from AzureOpenAIGenerator for default_headers:

haystack/haystack/components/generators/azure.py

Line 71 in 852900d

default_headers: Optional[Dict[str, str]] = None,

and

haystack/haystack/components/generators/azure.py

Line 152 in 852900d

default_headers=self.default_headers,

How did you test it?

Ran the unit tests and also tested with my Azure set up that uses a subscription key.

Notes for the reviewer

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:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[CLAassistant]

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[coveralls]

Pull Request Test Coverage Report for Build 11790285279

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 36 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.002%) to 90.141%

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Files with Coverage Reduction	New Missed Lines	%
components/embedders/azure_text_embedder.py	12	67.39%
components/embedders/azure_document_embedder.py	24	54.29%

Totals
Change from base Build 11781566054:	0.002%
Covered Lines:	7744
Relevant Lines:	8591

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💛 - Coveralls

[Amnah199]

@nuernber thanks for the contribution. Can you please sign the CLA?

[davidsbatista]

Suggested change

	:param default_headers: Default headers to use for the AzureOpenAI client.
	:param default_headers: Default headers to send to the AzureOpenAI client.

[davidsbatista]

Suggested change

	:param default_headers: Default headers to use for the AzureOpenAI client.
	:param default_headers: Default headers to send to the AzureOpenAI client.

[davidsbatista]

@nuernber left a few comments - one question still, is the default_header an optional or mandatory parameter according to the Azureus API?

[Amnah199]

@davidsbatista default_headers is an optional parameter in AzureOpenAI.
https://github.com/openai/openai-python/blob/7cdc6ddbdd3c09e567c5582490aec9d7f99c468e/src/openai/lib/azure.py#L81