[App Configuration] - Head request support

[linglingye001]

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• Added impacted package name to the issue description
• Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• Added a changelog (if necessary)

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

@azure/app-configuration

[Copilot]

Pull request overview

This PR adds HEAD request support to the App Configuration client through a new checkConfigurationSettings method. This allows clients to efficiently check if configuration settings have changed by retrieving only HTTP headers (including ETags) without the response body.

Changes:

• Added checkConfigurationSettings method that performs HEAD requests to check configuration settings status
• Implemented proper handling of 200 (success) and 304 (not modified) responses with ETag support
• Added comprehensive test coverage for the new method including ETag-based change detection

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
sdk/appconfiguration/app-configuration/src/appConfigurationClient.ts	Implements the new checkConfigurationSettings public method and private helper checkConfigurationSettingsRequest, adds imports for generated types
sdk/appconfiguration/app-configuration/test/public/index.spec.ts	Adds test suite covering basic HEAD requests, 304 responses with unchanged ETags, and 200 responses when content changes
sdk/appconfiguration/app-configuration/review/app-configuration-node.api.md	Updates API review file to include the new public method signature
sdk/appconfiguration/app-configuration/assets.json	Updates test assets tag to new recording version

Comments suppressed due to low confidence (1)

sdk/appconfiguration/app-configuration/src/appConfigurationClient.ts:55

• The KeyValueListResult import appears to be unused. This import was added but is not referenced anywhere in the code. Consider removing it to keep imports clean.

} from "./generated/src/models/index.js";