fuzz: make H2 codec fuzz test more robust to unexpected new streams. #4234
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Previously, mutations that generated new streams that we weren't expecting could cause the fuzzer
itself to dereference a null pointers in ON_CALL(newStream).
Fixes oss-fuzz issue https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9813.
Risk level: Low
Testing: Corpus entry added.
Signed-off-by: Harvey Tuch htuch@google.com