test(GlAvatarLabeled): Fix broken storyshots

What does this MR do?

test(GlAvatarLabeled): Fix broken storyshots

It seems !2786 (merged) broke storyshots for the GlAvatarLabeled stories.

While Webpack was updated in that MR to import images, Jest was not. Jest is involved because it's used as the test runner for storyshots.

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines.
• GitLab UI's contributing guidlines.
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  • [-] Status Page: mr_url
• Added the ~"component:*" label(s) if applicable.

Security

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• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
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Accessibility

If this MR adds or modifies a component, take a few moments to review the following:

• [-] All actions and functionality can be done with a keyboard.
• [-] Links, buttons, and controls have a visible focus state.
• [-] All content is presented in text or with a text equivalent. For example, alt text for SVG, or aria-label for icons that have meaning or perform actions.
• [-] Changes in a component’s state are announced by a screen reader. For example, changing aria-expanded="false" to aria-expanded="true" when an accordion is expanded.
• [-] Color combinations have sufficient contrast.