fix: Remove redundant retrieval of Azure client ID from Key Vault in create_grants_index.py

[Abdul-Microsoft]

Purpose

• This pull request makes a minor change to the secret retrieval logic in infra/scripts/index_scripts/create_grants_index.py. The unnecessary retrieval of the AZURE-CLIENT-ID secret has been removed, streamlining the script.

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

Verify that the following are valid

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