chore: Add UI validations (#173)

Author: amrkk123

modules/simple-sa/metadata.display.yaml

@@ -36,6 +36,8 @@ spec:
           name: display_name
           title: Display Name
           level: 1
+          regexValidation: ^.{1,100}$
+          validation: Display name must be between 1 and 100 characters.
         name:
           name: name
           title: Name
@@ -47,3 +49,5 @@ spec:
         project_roles:
           name: project_roles
           title: Project Roles
+          regexValidation: "^(roles/[a-zA-Z0-9_.]+|(projects/[a-z][a-z0-9-]{4,28}[a-z0-9]|organizations/[0-9]+)/roles/[a-zA-Z0-9_]+)$"
+          validation: Role must be a valid Google Cloud IAM role name, in the format of 'roles/{role_name}'.