4963: test: improve performance of delete_index.rs r=curquiza a=DerTimonius
# Pull Request
## Related issue
related to #4840
## What does this PR do?
This PR follows the instructions in #4840 and improves the performance of `meilisearch/tests/index/delete_index.rs`. The tests run locally, if they fail in the CI I'll try to fix them
## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?
Thank you so much for contributing to Meilisearch!
Co-authored-by: Timon Jurschitsch <timon.jurschitsch@gmail.com>