feat: collect more metrics for fixed isl/osl scenarios

[cquil11]

• add p90, p999 metrics for e2el, interactivity, and ttft

[github-actions]

Thanks for the contribution! For vLLM & SGLang, please ensure that your recipes is similar to the official vLLM recipes and/or the SGLang cookbook

• https://cookbook.sglang.io/
• https://docs.vllm.ai/projects/recipes/en/latest/

If it is not, please create a PR first before we can merge your PR into the master branch. Let's ensure that the documentation is first class such that the entire ML community can benefit from your hard work! Thank you

• https://github.com/vllm-project/recipes
• https://github.com/sgl-project/sgl-cookbook

[cquil11]

Depends on @adibarra updating DB schema.

[cquil11]

Follow up: #939
@adibarra