Add support for required configuration entries in pulumi new

[aureq]

Hello!

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Issue details

Pulumi projects support templates (ref) when running pulumi new. The command prompts the user to enter values but does not force the user to provide a value (ie, a prompt may be skipped).

Both for the CLI and the New Project Wizard, adding the key required: true would require the user to enter a non-empty value, even when no default value has been specified.

Affected area/feature

• CLI (pulumi new)
• New Project Wizard

[Frassle]

This is probably another case of us needing to fix #14775 first.