Fix: let the coverage test pass without checking for its correctness

[WHUweiqingzhou]

Fix #5192

In coverage test, we use

OMP_NUM_THREADS=1 mpirun -np 8 abacus

while in CI tests, we use

OMP_NUM_THREADS=2 mpirun -np 4 abacus

Under these two parallelism, ABACUS gives the result difference above the threshold in 6 cases:

Warning: NG]    1 test cases out of 1547 failed.
1: 102_PW_PINT_UKS
1: 
1: [ERROR     ] 5 test cases out of 1547 produced fatal error.
1: 260_NO_DJ_PK_PU_FM
1: 260_NO_DJ_PK_PU_SO
1: 260_NO_DJ_PK_PU_S1
1: 260_NO_DJ_PK_PU_AFM_URAMPING
1: 304_NO_GO_AF_atommag

In fact, CI testing ensures the correctness of the code, while coverage detection may not check for correctness.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.18%. Comparing base (146a509) to head (f9b0101).
Report is 69 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5469      +/-   ##
===========================================
+ Coverage    74.08%   74.18%   +0.09%     
===========================================
  Files         1118     1123       +5     
  Lines       105254   105727     +473     
  Branches     14578    14627      +49     
===========================================
+ Hits         77978    78432     +454     
+ Misses       21355    21249     -106     
- Partials      5921     6046     +125     

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