[3.14] gh-109638: Fix exponential time in csv.Sniffer for doubled quotes (GH-154868) - #155112
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…ed quotes (pythonGH-154868) (cherry picked from commit d52184b)
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…ed quotes (pythonGH-154868) (pythonGH-155112) (cherry picked from commit d52184b)
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Manual backport of #154868 (commit d52184b).
Lib/csv.py applied cleanly. The conflict in Lib/test/test_csv.py was only in the surrounding context: the 3.15 file has tests from other PRs which are not backported, so only the five tests added by GH-154868 were taken.