Wait for data to arrive in EndToEndTest.FlowControlsSynced.
Wait for data to arrive in EndToEndTest.FlowControlsSynced.

Make sure server receives all data.  When using IETF QUIC, also make sure client receives SETTINGS frame.  This allows the test to be simplified a bit.

gfe-relnote: n/a, test-only change.
PiperOrigin-RevId: 265739393
Change-Id: I32f6bc68951905d6ca1f90c1d13a4ae237e6de1d

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