Enable OTEL metrics collection in Pulp (pre)

Balasankar 'Balu' Crequested to merge
add-otel-collector-for-pulp into master

What

Enable OTEL Metrics collection in Pulp. Depends on gitlab-com/gl-infra/charts!852 (merged).

Why

So that metrics from Pulp pods can be collected.

Links to relevant issues

https://gitlab.com/gitlab-org/build/team-tasks/-/issues/112

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