fix: updated the echo to print to work with vscode web terminal

[Dhruvkumar-Microsoft]

Purpose

This pull request refactors the post-deployment messaging in both azure.yaml and azure_custom.yaml to improve formatting and consistency. The main change is replacing echo statements with printf for better control over output formatting, and updating the way the frontend application URL is displayed.

Post-deployment messaging improvements:

• Replaced all echo statements with printf in the post-deployment steps, ensuring consistent formatting and spacing in both azure.yaml and azure_custom.yaml. [1] [2]
• Updated the frontend application URL output to use printf with format specifiers, making the URL display more robust and readable. [1] [2]

Does this introduce a breaking change?

• [ ] Yes
• [x] No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

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