[Misc] Add OpenTelemetry metrics to CTA

Description

This MR adds opentelemetry to CTA.

• Some small abstractions have been introduced that allow developers to:
  • Create a telemetry configuration
  • Initialise telemetry in a consistent manner using this configuration
  • Globally (uniquely) define instruments per library. Duplicate instrument registrations are considered a semantic error

Overview of the changes in the MR:

• .gitlab/ci: manually triggered testing for testing telemetry correctness
• common/semconv/: Semantic conventions constants
• common/telemetry/: basic code to provide telemetry functionality
• continuousintegration/: add cta-dependencies as a repo as this contains the opentelemetry-cpp RPMs. Update the pods to use a flexible telemetry configuration and add basic system test for telemetry correctness. Add option --enable-telemetry to build_deploy.sh
• catalogue/ and rdbms/: Updates to be able to extract info about the DB connection at the place where queries are instrumented
• The remainder is for the initialisation of telemetry and the usage of instruments

Checklist

• Documentation reflects the changes made. See https://gitlab.cern.ch/cta/eoscta-docs/-/merge_requests/73
• Merge Request title is clear, concise, and suitable as a changelog entry. See this link
• Create operations ticket for setting this up and testing this in preproduction. Done, see https://gitlab.cern.ch/cta/operations/-/issues/1784

References

Closes #1135 (closed) Closes #1296 (closed)