test: ensure WPT report is in out/wpt #5176

Job	Run time
Build slim tarball	4m 49s
x86_64-linux: with shared libraries	21m 17s
aarch64-darwin: with shared libraries	22m 13s
x86_64-darwin: with shared libraries	44m 6s
aarch64-linux: with shared libraries	17m 55s
	1h 50m 20s

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