Modify gl-icon in email_verification.vue to use info variant and size 16

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What does this MR do and why?

This merge request updates the gl-icon component in the email verification Vue file (ee/app/assets/javascripts/users/identity_verification/components/email_verification.vue). Specifically, it:

1. Changes the icon variant from subtle to info
2. Sets the icon size to 12 to 16

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Related to #506120 (closed)