ICU-22724 Clean up import statements

tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/IcuConverterConfig.java

diff --git a/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/IcuConverterConfig.java b/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/IcuConverterConfig.java
index a99ba70..0887597 100644
--- a/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/IcuConverterConfig.java
+++ b/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/IcuConverterConfig.java
@@ -4,7 +4,6 @@
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
-import static java.util.stream.Collectors.joining;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -22,7 +21,6 @@
 import com.google.common.collect.ImmutableSetMultimap;
 import com.google.common.collect.ImmutableTable;
 import com.google.common.collect.SetMultimap;
-import com.google.common.collect.Sets;
 import com.google.common.collect.Table;
 import com.google.common.collect.TreeBasedTable;
 import com.google.common.collect.TreeMultimap;

tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/LdmlConverterConfig.java

diff --git a/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/LdmlConverterConfig.java b/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/LdmlConverterConfig.java
index 95ee673..72241b6 100644
--- a/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/LdmlConverterConfig.java
+++ b/tools/cldr/cldr-to-icu/src/main/java/org/unicode/icu/tool/cldrtoicu/LdmlConverterConfig.java
@@ -6,7 +6,6 @@
 import java.util.Map;
 import java.util.Set;
 
-import com.google.common.base.Preconditions;
 import org.unicode.cldr.api.CldrDraftStatus;
 import org.unicode.icu.tool.cldrtoicu.LdmlConverter.OutputType;
 

tools/cldr/cldr-to-icu/src/test/java/org/unicode/icu/tool/cldrtoicu/SupplementalDataTest.java

diff --git a/tools/cldr/cldr-to-icu/src/test/java/org/unicode/icu/tool/cldrtoicu/SupplementalDataTest.java b/tools/cldr/cldr-to-icu/src/test/java/org/unicode/icu/tool/cldrtoicu/SupplementalDataTest.java
index 6d53170..ca15ad4 100644
--- a/tools/cldr/cldr-to-icu/src/test/java/org/unicode/icu/tool/cldrtoicu/SupplementalDataTest.java
+++ b/tools/cldr/cldr-to-icu/src/test/java/org/unicode/icu/tool/cldrtoicu/SupplementalDataTest.java
@@ -22,7 +22,6 @@
 import org.unicode.cldr.tool.LikelySubtags;
 import org.unicode.cldr.util.LanguageTagCanonicalizer;
 import org.unicode.cldr.util.LocaleIDParser;
-import org.unicode.cldr.util.SupplementalDataInfo;
 import org.unicode.icu.tool.cldrtoicu.testing.FakeDataSupplier;
 
 import com.google.common.base.Joiner;