Migrate loading icon to be Pajamas compliant
What does this MR do and why?
Migrates the loading icon in app/assets/javascripts/gpg_badges.js to the new gl-loading-icon as part of https://gitlab.com/gitlab-org/ecosystem-stage/team-tasks/-/issues/110
Screenshots or screen recordings
| before | after |
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How to set up and validate locally
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Add a GPG key to you account (guide)
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View a blob that was recently changed by you
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Notice the loading icon while the GPG badge is being loaded
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #353726 (closed)