Explicitly import spriteIcon instead of global

What does this MR do?

Several files are using explicit gl.utils.spriteIcon instead of importing spriteIcon explicitly

This results in failing several tests when being run separately^

• spec/javascripts/image_diff/helpers/badge_helper_spec.js
• spec/javascripts/image_diff/helpers/comment_indicator_helper_spec.js

See #67206 (moved) for details

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content