test: Exclude parsing input labels from coverage

[chfast]

EEST don't use labels so exclude the code parsing labels from coverage by using gcov markers in comments.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.24%. Comparing base (40e3b72) to head (6ee6bda). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1071 +/- ## ========================================== - Coverage 94.24% 94.24% -0.01% ========================================== Files 158 158 Lines 17080 17077 -3 ========================================== - Hits 16097 16094 -3 Misses 983 983 ``` | [Flag](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | Coverage Δ | | |---|---|---| | [eof_execution_spec_tests](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | `17.79% <ø> (-0.01%)` | :arrow_down: | | [ethereum_tests](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | `26.48% <ø> (-0.02%)` | :arrow_down: | | [ethereum_tests_silkpre](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | `19.09% <ø> (-0.02%)` | :arrow_down: | | [execution_spec_tests](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | `20.21% <ø> (-0.01%)` | :arrow_down: | | [unittests](https://app.codecov.io/gh/ethereum/evmone/pull/1071/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | `89.30% <ø> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files with missing lines](https://app.codecov.io/gh/ethereum/evmone/pull/1071?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum) | Coverage Δ | | |---|---|---| | [test/statetest/statetest\_loader.cpp](https://app.codecov.io/gh/ethereum/evmone/pull/1071?src=pr&el=tree&filepath=test%2Fstatetest%2Fstatetest_loader.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ethereum#diff-dGVzdC9zdGF0ZXRlc3Qvc3RhdGV0ZXN0X2xvYWRlci5jcHA=) | `96.33% <ø> (-0.04%)` | :arrow_down: |