feat: add default_headers for Azure embedders

[Amnah199]

Related Issues

• fixes Support default_headers for AzureOpenAIDocumentEmbedder and AzureOpenAITextEmbedder #8534

Proposed Changes:

Replaces the old PR: #8535
Add default_headers parameter as a keyword argument to AzureOpenAIDocumentEmbedder and AzureOpenAITextEmbedder.

How did you test it?

Ran the tests and CI

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: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 12735209951

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 31 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.04%) to 91.303%

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Files with Coverage Reduction	New Missed Lines	%
components/embedders/azure_text_embedder.py	9	71.74%
components/embedders/azure_document_embedder.py	22	57.14%

Totals
Change from base Build 12713355058:	0.04%
Covered Lines:	8850
Relevant Lines:	9693

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💛 - Coveralls

[anakin87]

Looks good!

I would recommend adding a test_from_dict test case to both embedders and then merge.