Use graph build and test for PR builds

[dfederm]

Bug

Fixes: N/A

Description

This changes uses the MSBuild graph to build and runs test as part of the graph. This means that build and test is happening concurrently and can save a bunch of time.

From local testing:

Baseline build: 1:15
Graph build: 1:12

Baseline build & test (serial): 3:30
Graph build & test (concurrent): 1:21

Pipeline numbers: TBD

PR Checklist

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

[microsoft-github-policy-service[bot]]

This PR has been automatically marked as stale because it has no activity for 7 days. It will be closed if no further activity occurs within another 90 days of this comment. If it is closed, you may reopen it anytime when you're ready again, as long as you don't delete the branch.

[microsoft-github-policy-service[bot]]

This PR has been automatically marked as stale because it has no activity for 7 days. It will be closed if no further activity occurs within another 90 days of this comment. If it is closed, you may reopen it anytime when you're ready again, as long as you don't delete the branch.