Allow caller to skip checking required input attestations

[gproanomsft]

Problem: Optionality is incorrectly enforced by the VC SDK

Solution: When attestations are checked by the caller, skip the call to validateAllRequiredInputs

Validation: Unit tests did not detect regression

Type of change:

• [ ] Feature work
• [x] Bug fix
• [ ] Documentation
• [ ] Engineering change
• [ ] Test
• [ ] Logging/Telemetry

Risk:

• [ ] High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• [ ] Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• [x] Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)