CBG-4420: handle rev tree in history on processRev #12436

Job	Run time
build	1m 24s
lint	1m 56s
python-format	6s
addlicense	16s
python-lint	10s
test (macos)	6m 0s
test-default-collection	4m 26s
test (windows)	6m 34s
test-race	5m 55s
test (ubuntu)	4m 49s
test-sgcollect (macos-latest)	1m 2s
test-stats-definition-exporter (macos-latest)	1m 39s
test-sgcollect (windows-latest)	3m 49s
test-sgcollect (ubuntu-latest)	23s
test-stats-definition-exporter (windows-latest)	2m 33s
test-stats-definition-exporter (ubuntu-latest)	1m 17s
	42m 19s

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