Syscall differential fuzz test

[ImTei]

Description

This PR refactors differential syscall fuzz test.
The existing syscall fuzz tests were implemented as independent fuzz test case for each syscall. In this PR, we made a single entrypoint for every syscall, so make go fuzzer can use corpus from the last, different syscall execution, to allow fuzzer to simulate any combination of arbitrary syscalls.

For now, simply integrated new fuzz tests into the CI with running a bit short time. We're planning to enhance effect of fuzz tests, by managing consistent corpus, long-running dedicated fuzz server, and etc.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.82%. Comparing base (3f1f5fc) to head (0642afe).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   61.63%   61.82%   +0.19%     
==========================================
  Files          27       27              
  Lines        4147     4147              
==========================================
+ Hits         2556     2564       +8     
+ Misses       1444     1440       -4     
+ Partials      147      143       -4     

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