docs(ci-insights): remove health status explanation section (#7792)

The health status information is now documented within the app itself, so we're removing the explanation of what each status means to avoid duplication. CI Insights still tracks health status, but the documentation of what Healthy/Broken/Flaky means is now in the app.

## Changes:
- Removed the Health Status section that explained what the three statuses mean (Healthy, Broken, Flaky)
- Kept the mention that CI Insights tracks health status in the Jobs description
- Kept the Flaky Detection section as this is not documented in the app

This keeps the documentation accurate while avoiding duplication of information that's now shown contextually in the app.

Author: cursor[bot]

src/content/docs/ci-insights.mdx

@@ -44,16 +44,6 @@ cases.
 
 <Image src={TestsScreenshot} alt="CI Insights Tests" />
 
-### Health Status
-
-For each job and test, CI Insights computes a health status based on the last 10 runs:
-
-- **Healthy**: The job or test works fine and produces consistent results
-- **Broken**: The job or test consistently fails and needs attention
-- **Flaky**: The job or test is unstable and its outcome is not reliable
-
-This health status helps you quickly identify which components of your CI pipeline need attention.
-
 ### Flaky Detection
 
 CI Insights automatically detects flaky behavior in both jobs and tests using the same criteria: