fix(telemetry): keep consistency between tracing otlp endpoint

[bnjjj]

In our documentation when configuration http endpoint for tracing otlp exporter we say that users should only include the base address of the otlp endpoint. It was only working for grpc protocol and not http due to this bug. This inconsistency is now fixed with a workaround in the router waiting for the fix in openetelemetry crate.

So for example you'll have to specify the right path for http:

telemetry:
  exporters:
    tracing:
      otlp:
        enabled: true
        endpoint: "http://localhost:4318"
        protocol: http

Fixes #4798

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Checklist

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• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Tests added and passing³
  • Unit Tests
  • Integration Tests
  • Manual Tests

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[router-perf]

CI performance tests

• reload - Reload test over a long period of time at a constant rate of users
• events_big_cap_high_rate_callback - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity using callback mode
• events_without_dedup_callback - Stress test for events with a lot of users and deduplication DISABLED using callback mode
• large-request - Stress test with a 1 MB request payload
• const - Basic stress test that runs with a constant number of users
• no-graphos - Basic stress test, no GraphOS.
• step-jemalloc-tuning - Clone of the basic stress test for jemalloc tuning
• events - Stress test for events with a lot of users and deduplication ENABLED
• events_callback - Stress test for events with a lot of users and deduplication ENABLED in callback mode
• events_big_cap_high_rate - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity
• events_without_dedup - Stress test for events with a lot of users and deduplication DISABLED
• xxlarge-request - Stress test with 100 MB request payload
• xlarge-request - Stress test with 10 MB request payload
• step - Basic stress test that steps up the number of users over time