Resolve Pitest suppression for EmptyLineSeperator-2

[Kevin222004]

Related to #7797

kill mutation

checkstyle/.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

Lines 66 to 73 in fa68569

	<mutation unstable="false">
	<sourceFile>EmptyLineSeparatorCheck.java</sourceFile>
	<mutatedClass>com.puppycrawl.tools.checkstyle.checks.whitespace.EmptyLineSeparatorCheck</mutatedClass>
	<mutatedMethod>isLineEmptyAfterPackage</mutatedMethod>
	<mutator>org.pitest.mutationtest.engine.gregor.mutators.experimental.NakedReceiverMutator</mutator>
	<description>replaced call to com/puppycrawl/tools/checkstyle/api/DetailAST::getLastChild with receiver</description>
	<lineContent>final int lastChildLineNo = ast.getLastChild().getLineNo();</lineContent>
	</mutation>

and

checkstyle/.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

Lines 66 to 73 in fa68569

	<mutation unstable="false">
	<sourceFile>EmptyLineSeparatorCheck.java</sourceFile>
	<mutatedClass>com.puppycrawl.tools.checkstyle.checks.whitespace.EmptyLineSeparatorCheck</mutatedClass>
	<mutatedMethod>isLineEmptyAfterPackage</mutatedMethod>
	<mutator>org.pitest.mutationtest.engine.gregor.mutators.experimental.NakedReceiverMutator</mutator>
	<description>replaced call to com/puppycrawl/tools/checkstyle/api/DetailAST::getLastChild with receiver</description>
	<lineContent>final int lastChildLineNo = ast.getLastChild().getLineNo();</lineContent>
	</mutation>

and

checkstyle/.ci/pitest-suppressions/pitest-whitespace-suppressions.xml

Lines 39 to 46 in fa68569

	<mutation unstable="false">
	<sourceFile>EmptyLineSeparatorCheck.java</sourceFile>
	<mutatedClass>com.puppycrawl.tools.checkstyle.checks.whitespace.EmptyLineSeparatorCheck</mutatedClass>
	<mutatedMethod>getViolationAstForPackage</mutatedMethod>
	<mutator>org.pitest.mutationtest.engine.gregor.mutators.experimental.NakedReceiverMutator</mutator>
	<description>replaced call to com/puppycrawl/tools/checkstyle/api/DetailAST::getLastChild with receiver</description>
	<lineContent>final int lastChildLineNo = ast.getLastChild().getLineNo();</lineContent>
	</mutation>

[Kevin222004]

I am on it, Make pr when it is approved

[rnveach]

This will be resolved under #12601 so I am closing this.