feat: globally disable progress bars

[ZanSara]

Related Issues

• fixes #5098

Proposed Changes:

• Add SilenceableTqdm, a class that wraps tqdm and automatically disables progress bars if HAYSTACK_PROGRESS_BARS is set to some falsey value (0, False, FALSE, false).
• Change all imports to from tqdm import tqdm, as the from tqdm.auto import tqdm was found really hard to intercept and wrap correctly.

For @dfokina: to disable all Haystack progress bars, users can now set and environment variable called HAYSTACK_PROGRESS_BARS to one of 0, False, FALSE, false. For example, in Bash (Linux) it's like export HAYSTACK_PROGRESS_BARS=0. That's enough to disable all progress bars.

How did you test it?

n/a

Notes for the reviewer

Should we test this class?

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

[coveralls]

Pull Request Test Coverage Report for Build 5387621975

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1146 unchanged lines in 20 files lost coverage.
• Overall coverage increased (+0.8%) to 43.77%

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Files with Coverage Reduction	New Missed Lines	%
nodes/file_classifier/file_type.py	1	98.28%
nodes/file_converter/markdown.py	1	98.25%
nodes/file_converter/init.py	2	88.24%
nodes/prompt/prompt_model.py	7	85.19%
nodes/prompt/invocation_layer/sagemaker_hf_text_gen.py	11	71.43%
document_stores/es_converter.py	16	21.57%
nodes/file_converter/image.py	21	25.4%
utils/import_utils.py	25	33.33%
utils/preprocessing.py	25	8.25%
document_stores/elasticsearch.py	40	45.07%

Totals
Change from base Build 5376241675:	0.8%
Covered Lines:	9980
Relevant Lines:	22801

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💛 - Coveralls

[anakin87]

This implementation looks very nice and clean to me.

• Can you think of an easy way of testing it?
• I think it should be documented somewhere.

[ZanSara]

Tests added! I decided to test only if the disable property is set, because I found really hard to figure out if the bar is being printed. On the other hand, I don't want to test tqdm itself, so this looks like a decent compromise. I also updated the PR description to clarify how to use this new feature.

[anakin87]

LGTM!