Added stub XQueue server to bok_choy test suite.

Added feedback check for AI-assessment test

Added peer assessment feedback test

Added tests for peer grading module
Added stub peer grading module service
Updated Studio/LMS page objects and tests to use bok-choy v0.1.0
Added LMS bok-choy tests from e2e repo

Add bok-choy tests for peer grading module, including calibration.