Link/Icon - Update unit tests related to crash fix defensive code changes

[TimRoe]

Description

This is a follow-up ticket to changes from PR #573 and associated with flagship ticket 9064. Functional enhancements/adjustments were made with that ticket that did not receive corresponding unit test additions due to the time constraints to ensure the changes themselves were available to flagship in a timely manner such that they can make the next flagship release to validate if the changes address the underlying crashing problem.

Acceptance Criteria

• Add/update useExternalLink unit tests to validate the new analytics/promise failure cases
  • With http URLs
  • With non-http URLs
• Add Icon unit tests
  • For new noIcon prop for null passthrough
  • For new alignWithTextLineHeight prop that wraps the icon in a View that keeps it visually aligned with text of line height sent
• Add/update Link unit tests
  • No clear of explicit needed updates, but potentially something around the Icon changes and Spacer separating
  • May be able to remove some tests that are now within Icon due to the changes