test: unify assertSnapshot stacktrace transform #3228

Job	Run time
Build slim tarball	1m 20s
aarch64-darwin: with shared libraries	31m 12s
aarch64-linux: with shared libraries	30m 40s
x86_64-linux: with shared libraries	36m 1s
x86_64-darwin: with shared libraries	46m 42s
	2h 25m 55s

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