refactor!: Improve PyPDFToDocument

[anakin87]

Related Issues

• fixes Improve PyPDFToDocument #7361

Proposed Changes:

Explained in the original issue.

Just a first draft.
If the approach is OK, I will add release notes

How did you test it?

CI, new tests

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 8419545663

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.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 97 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.3%) to 89.426%

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Files with Coverage Reduction	New Missed Lines	%
components/generators/openai.py	3	96.1%
components/generators/chat/hugging_face_tgi.py	5	94.85%
components/generators/hugging_face_local.py	5	91.89%
components/generators/hugging_face_tgi.py	5	94.44%
components/converters/pypdf.py	6	92.0%
dataclasses/document.py	6	93.4%
components/generators/chat/openai.py	18	77.88%
core/pipeline/pipeline.py	23	93.7%
utils/hf.py	26	77.95%

Totals
Change from base Build 8278967162:	0.3%
Covered Lines:	5514
Relevant Lines:	6166

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💛 - Coveralls