blip tester: pass full history to proposeChanges #14781

Job	Run time
test (ubuntu)	5m 10s
test (windows)	5m 21s
build	1m 22s
test (macos)	5m 8s
test-race	6m 12s
python-format	13s
lint	1m 50s
addlicense	13s
python-lint	10s
build cache perf tool	1m 14s
test-sgcollect (macos-latest)	1m 4s
test-stats-definition-exporter (macos-latest)	1m 21s
test-stats-definition-exporter (ubuntu-latest)	1m 15s
test-sgcollect (ubuntu-latest)	25s
test-stats-definition-exporter (windows-latest)	2m 5s
test-sgcollect (windows-latest)	3m 19s
test-default-collection	4m 44s
	41m 6s

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