App Config Spring - Remove Feature Flags as Config

[mrm9084]

Description

Feature Flags shouldn't be loaded as configuration. If they are loaded via snapshot they are loaded as actual feature flags.

PR Overview

This PR ensures that feature flags are no longer loaded as configuration, but are instead processed as dedicated feature flags when loading a snapshot.

• Refactored TestUtils to add a new overload for creating feature flag configuration settings.
• Modified AppConfigurationApplicationSettingPropertySource to return early in handleFeatureFlag.
• Updated tests to filter out feature flags from configuration setting key extraction and adjusted the FEATURE_ITEM creation with an eTag.

Reviewed Changes

File	Description
sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/TestUtils.java	Added a new overloaded method for creating feature flag configuration settings and adjusted inner loop processing.
sdk/spring/spring-cloud-azure-appconfiguration-config/src/main/java/com/azure/spring/cloud/appconfiguration/config/implementation/AppConfigurationApplicationSettingPropertySource.java	Updated handleFeatureFlag to bypass processing of feature flags as configuration.
sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/AppConfigurationApplicationSettingPropertySourceTest.java	Modified tests to exclude feature flag settings from configuration key extraction.
sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/AppConfigurationApplicationSettingPropertySourceSnapshotTest.java	Updated FEATURE_ITEM creation to include an eTag and ensure proper instantiation.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/TestUtils.java:81

• The inner loop redundantly converts the entire nodeParams object on each iteration. Consider moving the conversion outside of the loop so that it is executed only once, then iterate over the resulting map to add parameters.

for (int j = 0; j < nodeParams.size(); j++) {

[rossgrambo]

Is potentially a breaking change. Let's only release this in a major deploy.