[stress testing] Figure out notification strategy for stress test failures

When stress tests fail, we should be able to notify the stress test owner (via email, etc.). Additionally, this could also be thought of as "when stress test reaches condition, notify owner" such as high memory, exceptions, etc.

Most likely this will involve configurations through azure alerts against stress test metrics and logs, as all the telemetry should be available. We should have a default way for this to apply automatically for new stress tests and to automatically figure out the owner (likely via the `CODEOWNERS` file or some chart annotation).