Do not error if we cannot prompt for a profile in auth login (#1745)

## Changes
With #1370 we started to error if
a profile name was not provided in a non-tty setting. The Databricks
VSCode extension, however, uses the `auth login` command to simply
refresh the tokens. Thus, this PR is a regression fix for that use case.

## Tests
Manually, `databricks auth login --host
https://e2-dogfood.staging.cloud.databricks.com` no longer errors.
Instead it successfully refreshes the credentials.

cmd/auth/login.go

@@ -19,7 +19,7 @@ import (
 
 func promptForProfile(ctx context.Context, defaultValue string) (string, error) {
 	if !cmdio.IsInTTY(ctx) {
-		return "", fmt.Errorf("the command is being run in a non-interactive environment, please specify a profile using --profile")
+		return "", nil
 	}
 
 	prompt := cmdio.Prompt(ctx)