Add `convertFromGraphQLIds` GraphQL util

What does this MR do?

Follow-up to !55805 (comment 523068174)

Add convertFromGraphQLIds GraphQL util which is the opposite of convertToGraphQLIds. This MR also uses the newly added util to refactor app/assets/javascripts/access_tokens/components/projects_token_selector.vue#L91. See !55805 (comment 523068174) for more context.

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