test: unify assertSnapshot stacktrace transform #3018

Job	Run time
Build slim tarball	1m 26s
x86_64-darwin: with shared libraries	5m 20s
aarch64-darwin: with shared libraries	5m 20s
aarch64-linux: with shared libraries	5m 11s
x86_64-linux: with shared libraries	5m 15s
	22m 32s

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