test: unify assertSnapshot stacktrace transform #3219

Job	Run time
Build slim tarball	1m 30s
aarch64-darwin: with shared libraries	44m 17s
aarch64-linux: with shared libraries	32m 7s
x86_64-darwin: with shared libraries	57m 6s
x86_64-linux: with shared libraries	33m 24s
	2h 48m 24s

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