Revert "verify serialized buffer before accessing it in the deserializer"

[abadams]

Reverts #9395

Unfortunately the original PR didn't run on the one bot that tests serialization, and our round-trip testing shows that in a bunch of cases our flatbuffers fail to verify. This is obviously not a good thing, but we should temporarily revert this while figuring it out in order to keep CI green.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.12%. Comparing base (14144bf) to head (b6d10de).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9426      +/-   ##
==========================================
- Coverage   70.19%   70.12%   -0.07%     
==========================================
  Files         261      261              
  Lines       79399    79393       -6     
  Branches    19361    19359       -2     
==========================================
- Hits        55732    55677      -55     
+ Misses      17886    17880       -6     
- Partials     5781     5836      +55     

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