use custom mocha reporter to generate annotations

Created by: burmudar

This extends the Mocha Spec reporter to be able to output the test summary to file so that we can generate an accurate annotation depicting the exact failures instead of crafting some complex regex.

This is how the annotation looks when it is generated

• clean up test/debugging code
• correct naming for all the things
• correct location for all the things

Test plan

Local testing and main-dry-running