589652 - Aggregation framework orderBy to support parameterized dimensions

What does this MR do and why?

This MR adds support for ordering by parameterized dimensions in the aggregation framework's GraphQL API

The aggregation framework's orderBy argument did not support parameterized dimensions (such as date_bucket dimensions). When users attempted to sort by a parameterized dimension like eventDate(granularity: "daily"), they encountered the error:

"message": "the specified identifier is not available: 'eventDate'"

Encountered when working on ai usage events aggregation engine MR: !222948

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

Run this query locally on this MR branch

query {
  group(fullPath: "my-group") {
    aiUsage {
      events(
        feature: "code_suggestions"
        dateFrom: "2026-01-01"
        dateTo: "2026-02-28"
        orderBy: [{
          identifier: "eventDate",
          parameters: {granularity: "daily"},
          direction: DESC
        }]
      ) {
        nodes {
          dimensions {
            eventDate(granularity: "daily")
            feature
          }
          totalCount
        }
      }
    }
  }
}

references #589652 (closed)

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