Report unnecessary and unsupported warning suppressions at info level

Closes gh-418

spring-javaformat-eclipse/io.spring.javaformat.eclipse/src/io/spring/javaformat/eclipse/projectsettings/org.eclipse.jdt.core.prefs

@@ -82,7 +82,7 @@ org.eclipse.jdt.core.compiler.problem.typeParameterHiding=warning
 org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=enabled
 org.eclipse.jdt.core.compiler.problem.uncheckedTypeOperation=warning
 org.eclipse.jdt.core.compiler.problem.undocumentedEmptyBlock=ignore
-org.eclipse.jdt.core.compiler.problem.unhandledWarningToken=warning
+org.eclipse.jdt.core.compiler.problem.unhandledWarningToken=info
 org.eclipse.jdt.core.compiler.problem.unnecessaryElse=ignore
 org.eclipse.jdt.core.compiler.problem.unnecessaryTypeCheck=warning
 org.eclipse.jdt.core.compiler.problem.unqualifiedFieldAccess=ignore
@@ -99,7 +99,7 @@ org.eclipse.jdt.core.compiler.problem.unusedParameterIncludeDocCommentReference=
 org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=disabled
 org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
 org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
-org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
+org.eclipse.jdt.core.compiler.problem.unusedWarningToken=info
 org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
 org.eclipse.jdt.core.formatter.disabling_tag=@formatter\:off
 org.eclipse.jdt.core.formatter.enabling_tag=@formatter\:on