E2E: Automatically mark test as flaky if previous failures are present

What does this MR do and why?

Fetches execution data and calculates pass_rate for specs and marks failed specs in merge request pipelines as flaky if pass rate is less than 98%. Also add pass rate argument to spec for easier evaluation of how flaky the spec is.

Screenshots or screen recordings

Failures list:

Single spec:

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.