[cxx-interop] Fix a potential dangling pointer in String(cxxString:)
#59297
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`cxxString` might get deallocated immediately after `c_str()` call, which would mean that the pointer passed to `String(cString:)` points to invalid memory. We haven't actually seen this, but let's preemptively add an explicit `withExtendedLifetime` call to avoid running into this in the future.
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cxxStringmight get deallocated immediately afterc_str()call, which would mean that the pointer passed toString(cString:)points to invalid memory.We haven't actually seen this, but let's preemptively add an explicit
withExtendedLifetimecall to avoid running into this in the future.Similar to #59152.