Contribution analytics: Remove request batching when using Clickhouse

Stop restricting request size when using the Clickhouse backend. The batching solution was added to improve load times for PostgresQL, but actually slows the response when fetching from Clickhouse.

Screenshots or screen recordings

There's no visible changes, but you can monitor the GraphQL requests going out to see the change. Instead of requests broken up on a weekly basis, the full time period should be used for the fetched data.

Before	After

How to set up and validate locally

• Visit the contribution analytics page for any group (ex. http://gdk.test/groups/flightjs/-/contribution_analytics)
• Switch the date range to Last month or Last 3 months
• Monitor the GraphQL requests on page load. Each request should be scoped to a single week
• Feature.enable(:clickhouse_data_collection)
• Monitor the GraphQL requests again. The requests should no longer be scoped

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #427601 (closed)