Run all process for all branches

[mikhailnikolaev]

We should modify the Azure Batch script to produce full graphs not only for master branch, but also for other branches. Moreover, Web Viewer should be modified to display results for different branches separately, or with additional labels.

[awf]

Specifically, we should not produce all graphs for all branches, but have a way in which a branch can initiate a benchmark run for that branch.
For example, one could add a "pr:\n - mybranch" line to pr-*.yaml, and remove it after the build, or use comment triggers https://docs.microsoft.com/en-us/azure/devops/pipelines/repos/github?view=azure-devops&tabs=yaml#comment-triggers