docs: Update readme with explore traces info #9506

Job	Run time
Run integration tests (test-e2e)	20m 39s
Run integration tests (test-integration-poller)	10m 12s
Run integration tests (test-e2e-deployments)	13m 23s
Lint	3m 15s
Build	1m 53s
Run integration tests (test-e2e-serverless)	7m 14s
Benchmark	9m 35s
Build technical documentation	20s
Check jsonnet & tempo-mixin	55s
Run Unit Tests (test-with-cover-pkg)	3m 14s
Vendor check	1m 18s
Run Unit Tests (test-with-cover-tempodb)	15m 42s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 20s
Run Unit Tests (test-with-cover-others)	12m 31s
	1h 51m 31s

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