Update Confiner 0.3.0

What does this MR do and why?

Move quarantine.yml -> master.yml

This is going to be a better design - instead of having two big yaml files for quarantine and dequarantine, we'll break down by environment.

Update Confiner version to 0.3.0.

Version 0.3.0 has environment quarantining functionality and dequarantining functionality.

Add dequarantine rule

When a test passes 10 times consecutively without any failures, a test is flagged for dequarantining.

How to set up and validate locally

• Checkout https://gitlab.org/gitlab-org/quality/confiner , $ bundle exec bin/confiner -r rules/gitlab.yml

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.