fix(shard): tell an unknown consensus operation from a corrupt header

[numinnex]

Fixes given_an_unknown_operation_when_a_consensus_frame_decodes_should_surface_an_upgrade_fence_signal test.

[codecov]

Codecov Report

❌ Patch coverage is 93.86792% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.88%. Comparing base (f8311d6) to head (4d27624).

Files with missing lines	Patch %	Lines
core/server_common/src/consensus_message.rs	90.00%	2 Missing and 8 partials ⚠️
core/shard/src/router.rs	84.21%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3931      +/-   ##
============================================
- Coverage     84.01%   83.88%   -0.13%     
  Complexity     1358     1358              
============================================
  Files          1214     1214              
  Lines        169851   169763      -88     
  Branches     137408   137537     +129     
============================================
- Hits         142703   142409     -294     
- Misses        23437    23504      +67     
- Partials       3711     3850     +139     

Components	Coverage Δ
Rust Core	84.75% <93.86%> (-0.07%)	⬇️
Java SDK	66.67% <ø> (ø)
C# SDK	74.99% <ø> (-1.54%)	⬇️
Python SDK	90.13% <ø> (ø)
PHP SDK	84.48% <ø> (ø)
Node SDK	95.90% <ø> (ø)
Go SDK	68.29% <ø> (ø)

Files with missing lines	Coverage Δ
core/binary_protocol/src/consensus/header.rs	81.87% <100.00%> (+0.30%)	⬆️
core/binary_protocol/src/consensus/operation.rs	97.54% <100.00%> (+0.06%)	⬆️
core/server/src/partition_reconciler.rs	97.90% <100.00%> (+0.06%)	⬆️
core/shard/src/metrics.rs	86.55% <ø> (ø)
core/shard/src/router.rs	81.49% <84.21%> (+7.92%)	⬆️
core/server_common/src/consensus_message.rs	82.70% <90.00%> (+1.40%)	⬆️

... and 73 files with indirect coverage changes

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[numinnex]

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[numinnex]

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