[WebDriver] Reuse "Find Elements" handler in "Find element" #37737
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All "Find Element ..." in spec has exactly same step has "Find Elements ...", except they extract the first element if there is any. We now reuse the handler instead of running numerous repetitive steps, same as what we did for "Find Element from Shadow Root" in #37578.
This reduces binary size by 98KB for Release profile in Windows and improves maintainability.
Testing:
./mach test-wpt -r .\tests\wpt\tests\webdriver\tests\classic\find_element* --product servodriver