docs: Update readme with explore traces info #9475

Job	Run time
Build	1m 49s
Benchmark	9m 30s
Run integration tests (test-e2e)	10m 53s
Lint	3m 20s
Run integration tests (test-integration-poller)	10m 23s
Run Unit Tests (test-with-cover-pkg)	3m 17s
Run integration tests (test-e2e-deployments)	10m 54s
Build technical documentation	21s
Run Unit Tests (test-with-cover-tempodb)	10m 53s
Run Unit Tests (test-with-cover-tempodb-wal)	10m 52s
Run integration tests (test-e2e-serverless)	7m 16s
Run Unit Tests (test-with-cover-others)	10m 52s
Check jsonnet & tempo-mixin	50s
Vendor check	1m 19s
	1h 32m 29s

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