Remove CI json.pipeline_includes_count logging

What does this MR do and why?

In !108280 (merged), we introduced logging the metric json.pipeline_includes_count to monitor the total number of includes per pipeline creation. It has served its purpose and is no longer necessary.

This MR removes this log to clean up the codebase.

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 #396776 (closed)