otel: add option to disable telemetry SDK resource attributes

[fcfort]

Commit Message: otel: add option to disable telemetry SDK resource attributes

Additional Description:

Currently, the OpenTelemetry tracer always populates telemetry SDK attributes (telemetry.sdk.language, telemetry.sdk.name, telemetry.sdk.version).

We have a customer-facing user interface for viewing traces and we don't want to leak internal Envoy details of our product.

This PR introduces a new configuration option set_telemetry_sdk_resource_attributes (default true) in OpenTelemetryConfig to allow opting-out of populating these attributes. When set to false, the attributes listed above will be omitted from the resource spans.

The new behavior (omitting attributes) is default off to preserve backward compatibility.

Risk Level: Low

Testing:

• Unit tests in test/extensions/tracers/opentelemetry/resource_detectors/resource_provider_test.cc have been updated and a new test added to validate that attributes are omitted when disabled.
• Unit tests in test/extensions/tracers/opentelemetry/opentelemetry_tracer_impl_test.cc have been updated to verify the configuration flag is passed correctly.

Docs Changes: None.
Release Notes: Added a configuration option to disable populating telemetry SDK attributes in the OpenTelemetry tracer.
Platform Specific Features: None.
Runtime guard: None.

[Disclosed usage of generative AI: Yes, used to assist in code modifications.]

[repokitteh-read-only]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @adisuissa
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #44689 was opened by fcfort.

see: more, trace.

[fcfort]

/retest due to errors downloading packages in CI

[adisuissa]

/lgtm api

Assigning @yanavlasov as codeowner
/assign @yanavlasov