Improve GC_REPORT_BUCKETS granularity

What does this MR do?

Better distribution of GC time buckets based on the metrics collected so far.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• [-] Code review guidelines
• [-] Merge request performance guidelines
• Style guides

Related to #65509 (moved)