configure codecov to ignore client package

[furykerry]

Ⅰ. Describe what this PR does

configure codecov to ignore client package

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.45%. Comparing base (2beb9d0) to head (2a80bcd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1910      +/-   ##
==========================================
+ Coverage   37.37%   42.45%   +5.08%     
==========================================
  Files         407      312      -95     
  Lines       36153    31328    -4825     
==========================================
- Hits        13511    13300     -211     
+ Misses      21253    16656    -4597     
+ Partials     1389     1372      -17     

Flag	Coverage Δ
unittests	42.45% <ø> (+5.08%)	⬆️

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