fix: quota unavailability for handling in quotacheck pipeline

[NirajC-Microsoft]

Purpose

This pull request introduces a minor update to the quota check scripts. The change ensures that the INSUFFICIENT_QUOTA flag is set when quota information for a model is missing, which helps downstream logic correctly identify and handle insufficient quota situations.

• Quota check scripts: Added logic to set INSUFFICIENT_QUOTA=true when no quota information is found for a model in both infra/scripts/checkquota_ckmv2.sh [1] and infra/scripts/checkquota_km.sh [2].
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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

• ...

Other Information