querystring: validate surrogate pairs in encodeStr #5655

Job	Run time
Build slim tarball	1m 58s
aarch64-darwin: with shared libraries	21m 2s
x86_64-darwin: with shared libraries	35m 36s
aarch64-linux: with shared libraries	20m 59s
x86_64-linux: with shared libraries	24m 10s
	1h 43m 45s

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