[r175] Ingester memory improvements by adjusting prealloc #9642

Job	Run time
Run integration tests (test-e2e)	20m 53s
Run Unit Tests (test-with-cover-pkg)	3m 15s
Run integration tests (test-integration-poller)	10m 9s
Run Unit Tests (test-with-cover-tempodb)	15m 47s
Benchmark	9m 40s
Run integration tests (test-e2e-deployments)	13m 24s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 19s
Run integration tests (test-e2e-serverless)	7m 13s
Run Unit Tests (test-with-cover-others)	12m 24s
Build	1m 50s
Build technical documentation	20s
Lint	3m 19s
Check jsonnet & tempo-mixin	55s
Vendor check	1m 37s
	1h 52m 5s

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