tool_operate: for -O, use "default" as filename when the URL has none

... or pick the last directory part from the path if available.

Instead of returning error.

Add test 6

tool_operate: for -O, use "default" as filename when the URL has none

... or pick the last directory part from the path if available.

Instead of returning error.

Add test 690 and 691 to verify. Test 76 and 2036 no longer apply.

Closes #13988

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