Document flaky test causes in Quality handbook
Why is this change being made?
To ease future debugging, we'd like to capture common (or uncommon!) causes for flakiness in our handbook.
This MR adds an initial list of causes plus a note that when flaky tests are fixed in the future, the fixer should confirm the root cause is present in the list.
Closes gitlab-org/gitlab#196786 (closed)
Author Checklist
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Provided a concise title for the MR -
Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what -
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Edited by Tanya Pazitny