Allow selecting QUIC version from command line in quic_client_interop_test
Allow selecting QUIC version from command line in quic_client_interop_test

This is test-only code.

PiperOrigin-RevId: 366821256
Change-Id: Icadff8892c47f0a2878dd664422ca8a2c3e6706b

google/quiche,google/quiche,google/quiche,google/quiche