Updated _find_left_bracket function used in pytest discovery to fix bug #17955
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Fix for #17954, #17951.
Instead of assuming an equal number of open and closed brackets as the current function does, this change assumes that the first open bracket of the last double colon "::" will be the bracket it is looking for. Since the testname will correspond to a python function, which cannot contain open brackets, the first open bracket must be it.