Removed ExcludeFromCodeCoverage attribute

[ymh199478]

Q	A
Branch?	v2.0(master)
Bug fix?	No
New feature?	No
Deprecations?	No
Internal Changed?	No
Removed	Yes
Tests pass?	Yes
Doc pr?	No

This commit removes the ExcludeFromCodeCoverageAttribute attribute because it is already available in .net standard 2.0.

[codecov-io]

Codecov Report

Merging #229 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   96.01%   96.01%           
=======================================
  Files          31       31           
  Lines        2660     2660           
=======================================
  Hits         2554     2554           
  Misses        106      106

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