messages are no longer copyable #13268

Job	Run time
build	1m 17s
python-format	4s
addlicense	10s
lint	1m 31s
python-lint	4s
test (macos)	3m 46s
test-default-collection	3m 54s
test-no-xattrs	3m 56s
test (windows)	6m 24s
test-race	5m 24s
test (ubuntu)	4m 19s
test-sgcollect (macos-latest)	52s
test-stats-definition-exporter (macos-latest)	39s
test-sgcollect (windows-latest)	3m 57s
test-stats-definition-exporter (windows-latest)	1m 36s
test-sgcollect (ubuntu-latest)	22s
test-stats-definition-exporter (ubuntu-latest)	1m 15s
	39m 30s

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