Print Setting frame for QuicSocketDataProvider if VerifyWriteData fails

The Setting frame is handled by the server's pending streams in
production, which requires encryption established.
But in unit tests, this is not necessary, because the goal for this QUIC
server session is to decode various HTTP frames.
So create a subclass from QuicSimpleServerSessionforTest
and override IsEncryptionEstablished to be always true.

BUG=366568084
TEST=net_unittests \
  --gtest_filter=QuicSocketDataProviderTest.PrintInitialSettingsPacket

Change-Id: Icc60eb0e20ea8ec63c0b4ff003c16342fc5ce1e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6055526
Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Xinan Lin <linxinan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1396283}