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fixes #1346
This adds basic validation for variables similar to what terraform does: https://developer.hashicorp.com/terraform/language/values/variables#custom-validation-rules
As follow-up and with work being made in #2758 we could handle additional types to variables and handle some kind of pre-validation if type is not compatible but I think HCL already handles this kind of diag for evaluation already.
Multiple validations case:
Dependency on other variables: