Remove eng/scripts/Preflight.ps1

[hallipr]

Analize-Code.ps1 already exists to run spell check and linters. It should be fixed up with additional checks if needed and the redundant script removed.

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @alzimmermsft @anannya03 @anuchandy @g2vinay @microsoft/azure-mcp @xiangyan99.