Update flaky tests project

Update the project from which flaky tests are obtained.

Currently this is the main gitlab-org/gitlab project.

This should now be https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues as per the work on quality#222 (closed)

Potentially update the codebase that calls https://gitlab.com/gitlab-org/quality/triage-ops/-/blob/master/lib/flaky_report.rb?ref_type=heads with the project / token of test-failure-issues