Fix usage of deprecated telemetry tags

[alzimmermsft]

Description

Fixes #48068

Updates tag usage of az.namespace to include additional azure.resource_provider.namespace tag, which is the replacement for az.namespace, and same for az.service_request_id to add azure.service.request.id. In both cases, both the deprecated and replacement tags will be included in telemetry to maintain backwards compatibility. Eventually, the deprecated tags will be removed from telemetry.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

Updates Azure SDK for Java OpenTelemetry tracing to emit both deprecated and replacement telemetry attributes for Azure namespace and service request ID, maintaining backwards compatibility while aligning with newer OpenTelemetry semantic conventions.

Changes:

• Updated attribute mapping to duplicate az.namespace -> azure.resource_provider.namespace and az.service_request_id -> azure.service.request.id.
• Adjusted core tracing + HTTP policy tests to validate presence of both old and new attributes.
• Updated Service Bus, Event Hubs, and AI Inference tracer tests to assert the new replacement attribute is also present.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/TracingIntegrationTests.java	Extends span assertions to validate azure.resource_provider.namespace is emitted alongside az.namespace.
sdk/eventhubs/azure-messaging-eventhubs/src/test/java/com/azure/messaging/eventhubs/TestSpanProcessor.java	Adds assertion for azure.resource_provider.namespace for Event Hubs spans.
sdk/core/azure-core-tracing-opentelemetry/src/test/java/com/azure/core/tracing/opentelemetry/OpenTelemetryTracerTest.java	Updates expectations to require both deprecated and replacement attributes across span creation paths.
sdk/core/azure-core-tracing-opentelemetry/src/test/java/com/azure/core/tracing/opentelemetry/OpenTelemetryHttpPolicyTests.java	Updates HTTP tracing tests to validate both namespace and service request id attributes, and ensures response bodies are consumed before assertions.
sdk/core/azure-core-tracing-opentelemetry/src/test/java/com/azure/core/tracing/opentelemetry/CreateTracerTests.java	Updates tracer-creation tests to validate both namespace attributes are set.
sdk/core/azure-core-tracing-opentelemetry/src/main/java/com/azure/core/tracing/opentelemetry/OpenTelemetryUtils.java	Implements key-mapping that duplicates deprecated attributes into their replacements during attribute population.
sdk/core/azure-core-tracing-opentelemetry/src/main/java/com/azure/core/tracing/opentelemetry/OpenTelemetryTracer.java	Uses the updated attribute-addition mapping when setting az.namespace so both tags are emitted.
sdk/core/azure-core-tracing-opentelemetry/CHANGELOG.md	Documents the addition of the replacement attributes while keeping deprecated ones for now.
sdk/ai/azure-ai-inference/src/test/java/com/azure/ai/inference/ChatCompletionClientTracerTest.java	Adds assertion for azure.resource_provider.namespace in AI inference tracing tests.