When a template is using hooks with pwsh, azd does not currently validate if pwsh is installed at the beginning of a command (like up or provision)
This results in a bad UX b/c azd could fail in the middle of a long process.

For this issue, implement a fail fast approach to check the hooks definitions and fail if pwsh is missing. Provide a clear message about how to install Powershell 7.

Related issues:

• [Issue] warn users when they need to install powershell 7 (or fallback to powershell 5) #4560
• [Issue/enhancement] Cross-platform shell commands behavior #3613