[DRAFT] Canary task rollouts

[kboom]

This shows the changes that we must make on the pipeline tasks side to allow canary rollouts. This needs to be adjusted to whatever today's state of the build config generator is, for which @merlynomsft support is required.

To generate the updated task format (with release and semver build version) run this:

node make.js build --task NuGetAuthenticateV1 --useSemverBuildConfig true; `
node make.js serverBuild --task NuGetAuthenticateV1 --useSemverBuildConfig true; `
node ./ci/stage-package.js true individually

This change includes a commit that demonstrates the expected outcome of the pipeline task generation with build config generator using the example of NuGetAuthenticateV1 (the result of running the commands above). This commit should be reverted prior to merging this pull request.