Revert "ZJIT: Skip TestOpenURIProxy on Linux (#16606)" #12830

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 7s
make (check, cppflags=-DVM_CHECK_MODE)	9m 16s
make (test-bundler-parallel, 50)	20m 51s
make (test-bundled-gems)	13m 57s
make (check, --enable-shared --enable-load-relative)	7m 25s
make (check, ubuntu-24.04, capi)	10m 39s
make (check, i686)	11m 27s
make (check, --disable-yjit)	7m 36s
make-ibm	0s
Ubuntu result	3s
	1h 35m 21s

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