Setup trace rake task to send traces directly to observe.gitlab.com

Jenny Kimrequested to merge
jk/trace-pipeline-setup into master

What does this MR do and why?

For issue gitlab-com/gl-infra/delivery#2770 (closed)

This change creates TRACES_PIPELINE which calls the traces rake task to send our pipeline traces directly to observe.gitlab.com.

For background context, we originally planned to set up otel-collector on our pipelines, but after extensive investigation, we have decided to do the simpler solution that does not involve otel-collector setup for now since there have been quite a few roadblocks. It's further described in that issue. If in the future, we were to investigate into otel-collector as a CI solution, please refer to commits in https://ops.gitlab.net/gitlab-org/release/tools/-/merge_requests/5/.

Author Check-list

  • Has documentation been updated?
Edited by Jenny Kim

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