[fix](style) Fix remaining CheckStyle violations in fastutil migration

- SchemaChangeJobV2: reorder Table before Table.Cell (CustomImportOrder)
- TransactionState: move SerializedName before it.unimi imports (CustomImportOrder)
- Partition: remove unused com.google.common.collect.Maps import
- TabletInvertedIndex: remove unused com.google.common.collect.Maps import

Verified zero checkstyle violations on all 26 PR-modified files using
checkstyle 9.3 (CI version) against fe/check/checkstyle/checkstyle.xml.

Generated by ThinkOps
diff --git a/fe/fe-core/src/main/java/org/apache/doris/alter/SchemaChangeJobV2.java b/fe/fe-core/src/main/java/org/apache/doris/alter/SchemaChangeJobV2.java
index e3f6cf8..5914b2b 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/alter/SchemaChangeJobV2.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/alter/SchemaChangeJobV2.java
@@ -75,8 +75,8 @@
 import com.google.common.collect.HashBasedTable;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
-import com.google.common.collect.Table.Cell;
 import com.google.common.collect.Table;
+import com.google.common.collect.Table.Cell;
 import com.google.gson.annotations.SerializedName;
 import it.unimi.dsi.fastutil.longs.Long2LongOpenHashMap;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
diff --git a/fe/fe-core/src/main/java/org/apache/doris/catalog/Partition.java b/fe/fe-core/src/main/java/org/apache/doris/catalog/Partition.java
index 8ed9e63..8134d87 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/catalog/Partition.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/catalog/Partition.java
@@ -27,7 +27,6 @@
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
 import com.google.gson.annotations.SerializedName;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
 import org.apache.logging.log4j.LogManager;
diff --git a/fe/fe-core/src/main/java/org/apache/doris/catalog/TabletInvertedIndex.java b/fe/fe-core/src/main/java/org/apache/doris/catalog/TabletInvertedIndex.java
index 47333a4..420c108 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/catalog/TabletInvertedIndex.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/catalog/TabletInvertedIndex.java
@@ -28,7 +28,6 @@
 
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ListMultimap;
-import com.google.common.collect.Maps;
 import com.google.common.collect.SetMultimap;
 import com.google.common.collect.Table;
 import com.google.common.collect.TreeMultimap;
diff --git a/fe/fe-core/src/main/java/org/apache/doris/transaction/TransactionState.java b/fe/fe-core/src/main/java/org/apache/doris/transaction/TransactionState.java
index 939e873..8607c7c 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/transaction/TransactionState.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/transaction/TransactionState.java
@@ -34,9 +34,9 @@
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
+import com.google.gson.annotations.SerializedName;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
 import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
-import com.google.gson.annotations.SerializedName;
 import lombok.Getter;
 import lombok.Setter;
 import org.apache.commons.lang3.StringUtils;