Fix TSan data race in UDP Socket Tests - #13875
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TSan flags concurrent socket operations on the identical host FD as a data race. This commit uses dup() to duplicate the socket file descriptor specifically for the background thread's connect() call, so sendto and connect can execute concurrently from two different threads without TSan data race on the fd struct. PiperOrigin-RevId: 955479183
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Fix TSan data race in UDP Socket Tests
TSan flags concurrent socket operations on the identical host FD
as a data race. This commit uses dup() to duplicate the socket file
descriptor specifically for the background thread's connect() call,
so sendto and connect can execute concurrently from two different
threads without TSan data race on the fd struct.