codecov - exclude protobuf-generated sources from coverage analysis

[pavoljuhas]

Ref: https://docs.codecov.com/docs/ignoring-paths

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.27% 🎉

Comparison is base (83609eb) 97.60% compared to head (d0c7df6) 97.87%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6268      +/-   ##
==========================================
+ Coverage   97.60%   97.87%   +0.27%     
==========================================
  Files        1116     1106      -10     
  Lines       95912    95589     -323     
==========================================
- Hits        93619    93562      -57     
+ Misses       2293     2027     -266     

Files Changed	Coverage Δ
cirq-core/cirq/circuits/circuit.py	98.43% <100.00%> (+<0.01%)	⬆️
cirq-core/cirq/circuits/frozen_circuit.py	99.26% <100.00%> (+0.25%)	⬆️
cirq-core/cirq/circuits/frozen_circuit_test.py	100.00% <100.00%> (ø)

... and 10 files with indirect coverage changes

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