See also #353.
In the internal build environment, there's an auto-injected component governance task which needs to run once during the build. This task doesn't need to run during the unit test, package, and internal release jobs.
Update the localization build so that it sends strings to our internal localization system on a nightly basis and produces a patch file which we can use to check translations back into the repo.
Internally, a "component detection" task is automatically injected into builds to make sure we're not using any components with known security vulnerabilities. Because this task runs during the main app builds, it doesn't also need to run in the pipeline which hands off strings to the localization system.
* Move build jobs to the Hosted VS2017 pool instead of our internal pool
* Move the prepare-release-internalonly job from a team-specific pool to a shared pool with more capacity
* Remove symbol publishing from PR/CI builds since it's not necessary; do it only in release builds
