Add shared runner duration to table

What does this MR do and why?

Adds the shared runner duration to the project table for group/personal namespaces.

Related to: #355666 (closed)

Screenshots or screen recordings

before	after

How to set up and validate locally

Seed data

ApplicationSetting.current.update(shared_runners_minutes: 400)
project = Project.find(20)
root_namespace = project.root_namespace

namespace_usage = Ci::Minutes::NamespaceMonthlyUsage.find_or_create_current(namespace_id: root_namespace)
Ci::Minutes::NamespaceMonthlyUsage.update_counters(namespace_usage, amount_used: 100, shared_runners_duration: 100)

project_usage = Ci::Minutes::ProjectMonthlyUsage.find_or_create_current(project_id: project)
Ci::Minutes::ProjectMonthlyUsage.update_counters(project_usage, amount_used: 100, shared_runners_duration: 100)

View changes

1. Visit Group > Settings > Usage Quotas
2. View the project table at the bottom of the view

MR acceptance checklist

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