[BanyanDB-Test] Add More E2E Cases

[hanahmily]

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• I had searched in the issues and found no similar feature requirement.

Description

We suffered several severe bugs while onboarding BanyanDB to the showcase environment. Most of them are due to the lack of appropriate E2E cases. I propose several cases here:

• Instance level Top-N list:
  • more than 0
  • no duplicated items
• Endpoint level Top-N list:
  • more than 0
  • no duplicated items
• Instance list:
  • more than 0
  • no duplicated items
• Endpoint list:
  • more than 0
  • no duplicated items

Use case

No response

Related issues

No response

Are you willing to submit a pull request to implement this on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct