Fix job_artifacts.size for GraphQL

Max Oreficerequested to merge
morefice/fix-artifact-size-graphql into master

What does this MR do and why?

Ref: #412080 (closed)

This MR updates the size attribute of job artifacts in our GraphQL API.

As explained in #382621 (comment 1171751544) we should use GraphQL::Types::BigInt here when dealing with huge number, checked with the team on slack this should be safe.

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Edited by Max Orefice

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