Fix usages of deprecated ciMinutesUsed GraphQL field

What does this MR do and why?

This MR replaces the usage of deprecated ciMinutesUsed with the new ciDuration GraphQL field in the frontend code, ahead of its removal in %18.0.

References

• Deprecate Types::Ci::RunnerUsageType#ci_minutes... (#497364 - closed)

Screenshots

This MR does not change the UI, here its the updated response:

https://gdk.test:3000/admin/runners/dashboard

How to set up and validate locally

Visit one of the changed pages.

MR acceptance checklist

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