Move component out of pages/ dir

What does this MR do and why?

Resolves #351096 (closed)

Generally we try to only have index.js files that initialize JS applications in the pages directory. The rest of the code generally goes directly in the assets/javascripts directory.

To conform with the above, this MR moves

ee/app/assets/javascripts/pages/groups/new/components/credit_card_verification.vue

to

ee/app/assets/javascripts/namespaces/verification/components/credit_card_verification.vue

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