Iterator Perfomance Improvements #7843

Job	Run time
Test integration e2e suite	29m 7s
Lint	3m 16s
Test packages - others	11m 8s
Test packages - pkg	3m 26s
Test packages - tempodb	15m 25s
Test packages - tempodb/wal	10m 38s
Benchmark	9m 18s
Build	1m 44s
Build technical documentation	20s
Test serverless integration e2e suite	6m 27s
Check jsonnet & tempo-mixin	1m 9s
Vendor check	1m 9s
	1h 33m 7s

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