feat(remote_config): send RC updates via telemetry (sampling rules)

[iunanua]

What does this PR do?

Get the id of the last RC update and use it to notify the configuration change via telemetry:

• ApmTracingConfig struct modified to include the id field received in the RC response
• RC tests changed accordingly
• Add telemetry::notify_configuration_update method to notify the configuration change from the update_sampling_rules_from_remote and clear_remote_sampling_rules callbacks using the same config_id received previously

Motivation

Make pass some test_dynamic_configuration.py::TestDynamicConfigSamplingRules tests

Additional Notes

libdatadog's TelemetryWorkerHandle manages internally the configuration property changes. It stores the initial configuration values and it is able to know when a value has changed and to emit the app-client-configuration-change telemetry event.

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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