Resolve GraphQL type mismatch in Cleanup policy type

What does this MR do and why?

Update GraphQL int type for last_run_deleted_size. The last_run_deleted_size is the cache size in bytes that has been deleted.

The type in the db is bigint, which allows for the below values

Range: -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807

The GraphQL int type allows for:

Range: -2,147,483,648 to +2,147,483,647

This MR updates the types to a bigint.

Once this is merged, a backport for 18.7 will be created.

References

Screenshots or screen recordings

See validation steps

How to set up and validate locally

1. On master branch.
2. In the rails console, enable these feature flags

Feature.enable(:virtual_registry_cleanup_policies)
Feature.enable(:ui_for_virtual_registry_cleanup_policy)
Feature.enable(:maven_virtual_registry)

3. Get a top level group, create a cleanup policy, We will add the max value for a bigint

group = Group.find_by(path: 'twitter')

VirtualRegistries::Cleanup::Policy.create!(
  group: group,
  keep_n_days_after_download: 30,
  cadence: 7,
  enabled: true,
  notify_on_success: true,
  notify_on_failure: true,
  status: :scheduled,
  last_run_deleted_entries_count: 250,
  last_run_deleted_size: 9223372036854775807,
  last_run_detailed_metrics: {
    'maven' => {
      'deleted_entries_count' => 150,
      'deleted_size' => 9223372036854775807
    },
    'container' => {
      'deleted_entries_count' => 100,
      'deleted_size' => 9223372036854775807
    }
  }
)

3. In GraphQL explorer, run this query.

query {
   group(fullPath: "twitter") {
     virtualRegistriesCleanupPolicy {
       lastRunAt
       lastRunDeletedSize
       lastRunDetailedMetrics {
         maven {
           deletedSize
           deletedEntriesCount
         }
        container {
          deletedSize
          deletedEntriesCount
        }
       }
       lastRunDeletedEntriesCount
     }
   }
 }

This will return an error:

"Internal server error: Integer out of bounds: 9223372036854775807 @ group.virtualRegistriesCleanupPolicy.lastRunDeletedSize (VirtualRegistryCleanupPolicy.lastRunDeletedSize). Consider using ID or GraphQL::Types::BigInt instead."

4. Switch to this branch, and run the query again. And it should return success with the value.

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Related to #584220 (closed)