Remove Opentelemetry instrumentation agent from the runtime

[lubosmj]

We decided to instrument our application code manually by leveraging a customized middleware implemented in pulpcore.

Refer to pulp/pulpcore#5943 for more.

[lubosmj]

The agent instruments the application by discovering and applying the necessary instrumentation at runtime. In pulpcore, we needed to either install opentelemetry-instrumentation-aiohttp-server, opentelemetry-instrumentation-django or opentelemetry-instrumentation-wsgi in order to see the actual metrics being reported. By removing the agent and changing the infrastructure, we are also decoupling the dependencies scattered across the repositories.