fix: use dynamic parameter resolution in the cli (#21734)

Uses dynamic parameters EvaluateTemplateVersion vs TemplateVersionRichParameters to determine initial parameter state.

Closes https://github.com/coder/coder/issues/19879

cli/cliui/parameter.go

@@ -69,7 +69,7 @@ func RichParameter(inv *serpent.Invocation, templateVersionParameter codersdk.Te
 		}
 	default:
 		text := "Enter a value"
-		if !templateVersionParameter.Required {
+		if defaultValue != "" {
 			text += fmt.Sprintf(" (default: %q)", defaultValue)
 		}
 		text += ":"
@@ -77,6 +77,10 @@ func RichParameter(inv *serpent.Invocation, templateVersionParameter codersdk.Te
 		value, err = Prompt(inv, PromptOptions{
 			Text: Bold(text),
 			Validate: func(value string) error {
+				// If empty, the default value will be used (if available).
+				if value == "" && defaultValue != "" {
+					value = defaultValue
+				}
 				return validateRichPrompt(value, templateVersionParameter)
 			},
 		})