Fix deprecated GlIcon size and property

What does this MR do?

This MR removes the use-deprecated-sizes property in gl-icon component in app/assets/javascripts/ide/components/shared/tokened_input.vue

Closes #324778 (closed) Part of https://gitlab.com/gitlab-com/marketing/community-relations/contributor-program/hackathon/-/issues/52

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Before	After

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Conformity

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Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
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