Add multi-threaded test for "INSERT ... RETURNING ..." and SQLITE_BUSY errors.

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@@ -1,5 +1,5 @@
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-D 2023-05-12T15:45:34.949
+C Add\smulti-threaded\stest\sfor\s"INSERT\s...\sRETURNING\s..."\sand\sSQLITE_BUSY\serrors.
+D 2023-05-12T19:02:50.042
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 F test/threadtest2.c a70a8e94bef23339d34226eb9521015ef99f4df8
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 # Remove this line to create a well-formed Fossil manifest.