test: fix e2e test failures

[ZanSara]

Related Issues

• fixes https://github.com/deepset-ai/haystack/actions/runs/6018856046/job/16327780836

Proposed Changes:

• Fixes several smaller errors in the e2e tests

How did you test it?

CI

Notes for the reviewer

n/a

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 6023389184

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 48.521%

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Totals
Change from base Build 6022428819:	0.0%
Covered Lines:	11561
Relevant Lines:	23827

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💛 - Coveralls