Integrate Sentry for performance and error tracing

For tracing and performance, it seems that Sentry is a good open source alternative to New Relic.

Sentry support is also available in GitLab.

added part::backend part::ci type::feature labels

assigned to @nik

created merge request !745 (merged) to address this issue

mentioned in merge request !745 (merged)

changed the description

closed with merge request !745 (merged)

mentioned in commit 28c1c1ac