Add Azure App Service account and resource group attributes

[Lewis-E]

Description:

Update the Azure App Service resource detector to emit:

• cloud.account.id - from WEBSITE_OWNER_NAME [sem-conv]
• azure.resource_group.name - from WEBSITE_RESOURCE_GROUP [sem-conv]

Updated resourceUri to take the above values as parameters.

Goal: Align the Java detector with the Azure App Service mapping tracked in collector-contrib #49616 and implemented for the Collector in collector-contrib #50287.

AI Disclosure: Pi Coding Agent was used to draft this PR, but I wrote this PR description and can explain all changes.

Existing Issue(s): n/a

Testing:

• Unit Tests
• Added assertions for the standalone account and resource-group attributes.
• Added coverage for parsing the subscription ID before + in WEBSITE_OWNER_NAME.
• Added coverage for independently missing owner and resource-group values.
• Deployed a test app & confirmed the correct attributes were detected.

Documentation:

This aligns the existing detector with the canonical Azure App Service resource attribute map.

Outstanding items:

Did not change cloud.platform from azure_app_service to azure.app_service even though that is the current convention per open-telemetry/semantic-conventions#1698

[Copilot]

Pull request overview

This pull request updates the Azure App Service resource detector in azure-resources to emit additional semantic convention attributes for Azure App Service environments, aligning the Java implementation with the Azure App Service resource attribute mapping used in OpenTelemetry Collector Contrib.

Changes:

• Emit cloud.account.id derived from WEBSITE_OWNER_NAME (including parsing the subscription ID before + when present).
• Emit azure.resource_group.name derived from WEBSITE_RESOURCE_GROUP.
• Refactor resourceUri construction to accept resource group and subscription ID as parameters, and expand unit test coverage for missing/parsed values.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
azure-resources/src/main/java/io/opentelemetry/contrib/azure/resource/AzureAppServiceResourceProvider.java	Adds cloud.account.id and azure.resource_group.name emission and refactors resource ID creation to use explicit subscription/resource-group inputs.
azure-resources/src/main/java/io/opentelemetry/contrib/azure/resource/IncubatingAttributes.java	Adds internal AttributeKey definitions for azure.resource_group.name and cloud.account.id consistent with existing incubating-attribute handling in this repo.
azure-resources/src/test/java/io/opentelemetry/contrib/azure/resource/AzureAppServiceResourceProviderTest.java	Adds assertions for the new attributes and coverage for parsing and missing owner/resource-group behavior.

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