feat: Validate request option in Mock mode

[thim81]

Addresses #2695

Summary

Replace this with something that explains what this PR is for and why it matters.

Checklist

• The basics
  • I tested these changes manually in my local or dev environment
• Tests
  • Added or updated
  • N/A
• Event Tracking
  • I added event tracking and followed the event tracking guidelines
  • N/A
• Error Reporting
  • I reported errors and followed the error reporting guidelines
  • N/A

Screenshots

BEFORE

yarn cli mock ../../examples/museum.openapi.yaml

AFTER

yarn cli mock ../../examples/museum.openapi.yaml --validate-request=false