Allow dropping rows for InvalidTargetDataCheck

[ParthivNaresh]

Fixes: #4115

[codecov]

Codecov Report

Merging #4116 (334b50c) into main (13d28c2) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #4116     +/-   ##
=======================================
+ Coverage   99.7%   99.7%   +0.1%     
=======================================
  Files        349     349             
  Lines      37719   37749     +30     
=======================================
+ Hits       37602   37632     +30     
  Misses       117     117             

Impacted Files	Coverage Δ
evalml/data_checks/data_check_message.py	100.0% <ø> (ø)
evalml/data_checks/invalid_target_data_check.py	100.0% <100.0%> (ø)
...ata_checks_tests/test_invalid_target_data_check.py	100.0% <100.0%> (ø)

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[jeremyliweishih]

LGTM