[test] Fix forward progress detection for lookaround groups#1
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When a quantified concatenation begins with a lookaround group, the forward progress checker fails to skip over the assertion's child subtree, leaving the analysis cursor misaligned and leading to false positives. This change skips the lookaround's child subtree, matching the treatment added for nullable quantifications in swiftlang#851.
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When a quantified concatenation begins with a lookaround group, the forward progress checker fails to skip over the assertion's child subtree, leaving the analysis cursor misaligned and leading to false positives.