Description

This PR explicitly sets:

enable_rbac_authorization=False

while creating the Azure Key Vault.

Why this change is needed:

Recent failures were observed after upgrading the Azure Management Key Vault SDK from v13 to v14.
Although public documentation suggests that RBAC authorization defaults remain unchanged when the value is not specified, actual behavior changed in v14.
As confirmed during discussion and a local PoC:

In SDK v13, Key Vault creation worked without explicitly setting enable_rbac_authorization
In SDK v14, when this value is not explicitly set, Key Vault access fails during runtime
Explicitly setting enable_rbac_authorization=False restores the earlier, working behavior

Jayesh validated this by running a local PoC comparing SDK v13 vs v14 behavior, and confirmed that explicitly disabling RBAC authorization is the correct and minimal fix.

Checklist

• I have read the contribution guidelines.
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• Pull request includes test coverage for the included changes.
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