Installer testing updates

[FuzzyCarter]

• Rework doc into a workflow template and organize information to be more readable.
• Added in Area: General Installer to scope missed testing opportunities & an optimized installer workflow path for smoke testing.
• Cleaned up and unified the doc's workflow steps & things to look out for.

Note: Reaching out to Lionbridge team to get missing "things to watch out for" in the Requirements area.