chore: remove unused functions `serialize_callback_handler` and `deserialize_callback_handler`

deepset-ai / haystack

:mag: AI orchestration framework to build customizable, production-ready LLM applications. Connect components (models, vector DBs, file converters) to pipelines or agents that can interact with your data. With advanced retrieval methods, it's best suited for building RAG, question answering, semantic search or conversational agent chatbots.

Apache License 2.0

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Related Issues

These utility functions are probably a leftover.

I checked that they are not used anywhere: haystack, core-integrations, integrations page, website, tutorials, cookbook...

Some related issues (in case you are interested in history :smiley:): #6979 #6988 https://github.com/deepset-ai/haystack-core-integrations/issues/415

Proposed Changes:

Remove these functions

How did you test it?

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

Pull Request Test Coverage Report for Build 10298900492

Details

0 of 0 changed or added relevant lines in 0 files are covered.

1 unchanged line in 1 file lost coverage.

Overall coverage increased (+0.02%) to 90.167%

Files with Coverage Reduction	New Missed Lines	%
components/generators/utils.py	1	66.67%
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Files with Coverage Reduction

New Missed Lines

components/generators/utils.py

66.67%

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Total:

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Totals
Change from base Build 10284638870:	0.02%
Covered Lines:	6914
Relevant Lines:	7668

Totals

Change from base Build 10284638870:

0.02%

Covered Lines:

6914

Relevant Lines:

7668

deepset-ai / haystack