Reduce exit sleep in tests run with race detector to zero

[masih]

Reduce exit sleep in tests run with race detector to zero to make the tests run faster.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.71%. Comparing base (c4b5f6a) to head (7ed3714).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #820      +/-   ##
==========================================
- Coverage   68.82%   68.71%   -0.11%     
==========================================
  Files          81       81              
  Lines        8307     8307              
==========================================
- Hits         5717     5708       -9     
- Misses       2100     2109       +9     
  Partials      490      490              

see 5 files with indirect coverage changes

[masih]

Looking at the CI run, this shaved off 1 minute from go test --race ./... compared to main.