chore: remove flaky end2end test for GPT35Generator

[ZanSara]

Related Issues

• fixes https://github.com/deepset-ai/haystack/actions/runs/6122946746/job/16619792413?pr=5744

Proposed Changes:

• Remove remove test_gpt35_generator_run_above_context_length from the GPT35Generator end2end tests

How did you test it?

n/a

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 6143680071

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 48.913%

---

Totals
Change from base Build 6122583009:	0.004%
Covered Lines:	11835
Relevant Lines:	24196

---

💛 - Coveralls