pkg/report: get only the thread local reports #18674

Job	Run time
build	2m 58s
old	7m 9s
race	5m 5s
race_dashboard	4m 43s
dashboard	2m 4s
aux	3m 57s
gvisor	4m 6s
arch (presubmit_arch_freebsd)	6m 41s
arch (presubmit_arch_darwin)	3m 50s
arch (presubmit_arch_linux)	7m 34s
arch (presubmit_arch_openbsd)	3m 46s
arch (presubmit_arch_executor)	3m 26s
arch (presubmit_arch_windows)	3m 46s
arch (presubmit_arch_netbsd)	3m 56s
	1h 3m 1s

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