Follow-up from "Fix project import error occurring due to default visibility"

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The following discussion from !53827 (merged) should be addressed:

• discussion: (+6 comments)

  @jameslopez: Should this be fixed via Gitlab::VisibilityLevelChecker instead? 🤔

  @georgekoltsov: Ideally this new validation could be a great opportunity to extend Gitlab::VisibilityLevelChecker but it might be a bigger task, since we would probably need to also add a reason for restriction to Gitlab::VisibilityEvaluationResult and if a reason is 'not_allowed_by_group' - set project visibility level to group visibility level. This could be done in a follow up in order to not block progress of this MR. So this change looks good to me 👍