test: unify assertSnapshot stacktrace transform #3226

Job	Run time
Build slim tarball	1m 39s
x86_64-linux: with shared libraries	53m 8s
aarch64-darwin: with shared libraries	54m 43s
x86_64-darwin: with shared libraries	54m 49s
aarch64-linux: with shared libraries	43m 36s
	3h 27m 55s

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