fix codecov for protobuf

[leizhiyuan]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1250 into develop will increase coverage by 13.78%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             develop    #1250       +/-   ##
==============================================
+ Coverage      35.65%   49.44%   +13.78%     
+ Complexity      2156     1651      -505     
==============================================
  Files            408      326       -82     
  Lines          21931    11439    -10492     
  Branches        3056     1415     -1641     
==============================================
- Hits            7820     5656     -2164     
+ Misses         13043     5155     -7888     
+ Partials        1068      628      -440

Impacted Files	Coverage Δ	Complexity Δ
...dec/protobuf/generated/RegisterRMRequestProto.java
.../protobuf/generated/BranchCommitResponseProto.java
.../io/seata/codec/protobuf/generated/ResultCode.java
...eata/codec/protobuf/generated/ResultCodeProto.java
...dec/protobuf/generated/GlobalRollbackResponse.java
...tobuf/generated/AbstractBranchEndRequestProto.java
...c/protobuf/generated/AbstractGlobalEndRequest.java
...ec/protobuf/generated/AbstractIdentifyRequest.java
...dec/protobuf/generated/RegisterTMRequestProto.java
...ata/codec/protobuf/generated/HeartbeatMessage.java
... and 72 more

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[lovepoem]

LGTM

[xingfudeshi]

lgtm