[ParseExample] Micro-optimization for ParseBytesList().
[ParseExample] Micro-optimization for ParseBytesList().

Currently we move a default-constructed tstring to the back of the parsed list before resizing and parsing into that object. This change avoids the move by "constructing" (where necessary) the string in place and mutating it directly.

PiperOrigin-RevId: 296538238
Change-Id: Ic5efdc83a378b198386e726531a121d3b81837fa

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