Consolidate documentation written for e2e tests under dev docs

What does this MR do?

The current documentation for QA was becoming separate from where it should be. If we want to bake in quality, we need to include the QA documentation within the development docs, not separate in the qa/docs directory.

Conformity

• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides

fyi @gl-quality