fix: Add execute permissions for validation scripts in preprovision hook

[Abdul-Microsoft]

This pull request includes a minor update to the azure.yaml file to ensure proper script execution by adding permission changes before running the scripts.

• azure.yaml: Updated the hooks: section to include chmod u+r+x commands for validate_model_deployment_quota.sh and validate_model_quota.sh scripts to ensure they have the necessary execute permissions before running.## Purpose

• ...

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
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What to Check

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Other Information

[github-actions]

🎉 This PR is included in version 1.7.0 🎉

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