test: enable wpt fetch/api idlharness tests #3570

Job	Run time
Build slim tarball	3m 18s
aarch64-linux: with shared libraries	22m 34s
x86_64-linux: with shared libraries	26m 6s
x86_64-darwin: with shared libraries	39m 14s
aarch64-darwin: with shared libraries	24m 50s
	1h 56m 2s

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