Uniqueness of first column is now checked before flagging it as a primary key

[simha104]

Pull Request Description

IDColumnsDataCheck now only returns an action code to set the first column as the primary key if it contains unique values

[codecov[bot]]

Codecov Report

Merging #3639 (88a39de) into main (39e5102) will increase coverage by 0.1%. The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #3639     +/-   ##
=======================================
+ Coverage   99.7%   99.7%   +0.1%     
=======================================
  Files        337     337             
  Lines      34004   34021     +17     
=======================================
+ Hits       33873   33890     +17     
  Misses       131     131             

Impacted Files	Coverage Δ
evalml/data_checks/id_columns_data_check.py	100.0% <100.0%> (ø)
evalml/tests/conftest.py	98.0% <100.0%> (+0.1%)	:arrow_up:
...ts/data_checks_tests/test_id_columns_data_check.py	100.0% <100.0%> (ø)

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