(MODULES-11567): Enhance validation methods to resolve deferred values for validation in sqlserver_instance type

[span786]

Summary

Improve validation logic in the sqlserver_instance type to handle deferred values

In the current implementation, when the preprocess_deferred flag is set to true, Puppet resolves deferred values before validation, allowing sqlserver_instance to validate parameters successfully.

However, when preprocess_deferred is false, deferred values remain unresolved at the time of validation, causing it to fail. To address this issue, we’ve updated the validation logic to explicitly resolve deferred values during validation, ensuring the module functions correctly regardless of the preprocess_deferred setting.

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified. (For example puppet apply)