[3.11] gh-108843: fix ast.unparse for f-string with many quotes #108980
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The core of the issue here is the fallback to
reprin_str_literal_helperwhen we can't find a workable quote type. This works fine for single strings, but doesn't work well for joined strings (since earlier values of the joined string may have been written assuming a different quote). Therefore, in the bad case, we go back and force use of repr with a single quote for all parts of the joined string. The assert checks that repr continues to work the way we expect it to work.