fix: Refactor app sample enabling logic in auth_init scripts

[Harsh-Microsoft]

Purpose

The issue was that the user needed to set AZURE_APP_SAMPLE_ENABLED to true by running the azd command themselves. If they didn't set it and selected true when prompted during azd up, the script didn't recognize their choice, which prevented the App Service from being deployed.

The root cause was that the script only checked the .env file for the AZURE_APP_SAMPLE_ENABLED variable. However, when the user selected this option during the prompt, azd saved the value in config.json instead of the .env file. I have updated the script to check config.json as well.

This pull request updates both the PowerShell (auth_init.ps1) and Bash (auth_init.sh) authentication initialization scripts to improve how they determine whether the "app sample" feature is enabled. The scripts now check both an environment variable and a configuration file, giving preference to the environment variable, and handle value normalization to ensure consistent behavior.

Configuration and logic improvements:

• Both auth_init.ps1 and auth_init.sh now read the appSampleEnabled setting from the .azure/<env>/config.json file, in addition to supporting the AZURE_APP_SAMPLE_ENABLED environment variable. The environment variable takes precedence if set. [1] [2]
• The scripts normalize the effective value to lowercase and treat any unset, empty, or "false" values as disabling the app sample, ensuring consistent and predictable script behavior. [1] [2]
• Updated exit messages to reflect the new logic and improve clarity for users. [1] [2]

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

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Other Information

[github-actions]

🎉 This PR is included in version 1.1.4 🎉

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