Clean up flaky tests handbook

David Dieulivolrequested to merge
update-flaky-tests-handbook-cleanup into main

Context

Contributes to Resolve documentation discrepancies between Fla... (gitlab-org/quality/analytics/team#417 - closed)

What does this MR do?

Removes outdated and redundant content from the flaky tests handbook to improve clarity and maintainability.

Edited by David Dieulivol

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