Stop running tests in Official Build

[jeffkl]

Bug

Fixes:

Description

This disables unit and functional tests in the Official Build by default. We can still schedule them for manually scheduled builds if needed. I copied the parameters from pull_request.yml to make sure they're in sync.

Here's a build I scheduled with Test signing: https://dev.azure.com/devdiv/DevDiv/_build/results?buildId=10243995&view=results

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.