lib: add space to class string of iterator objects and updated tests accordingly
Inserted a space in the string descriptor for URLSearchParamsIterator in the URL parser API so that it became URLSearchParams Iterator according to recent changes in the standards.
Sorry I didn't realize my commit message was bad until I read the guidelines.
Fixes: https://github.com/nodejs/node/issues/17540
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
lib