refactor: rename containsYear to isSpammyCategory

This is done as the name containsYear is ambiguous.
It not just checks for year to identify spammy categories.

app/src/main/java/fr/free/nrw/commons/category/CategoriesModel.kt

@@ -27,11 +27,12 @@ class CategoriesModel @Inject constructor(
     private var selectedExistingCategories: MutableList<String> = mutableListOf()
 
     /**
-     * Returns true if the item contains an year which should be ignored
-     * @param item
+     * Returns true if an item is considered to be a spammy category which should be ignored
+     *
+     * @param item a category item that needs to be validated to know if it is spammy or not
      * @return
      */
-    fun containsYear(item: String): Boolean {
+    fun isSpammyCategory(item: String): Boolean {
         //Check for current and previous year to exclude these categories from removal
         val now = Calendar.getInstance()
         val curYear = now[Calendar.YEAR]

app/src/main/java/fr/free/nrw/commons/repository/UploadRepository.java

@@ -149,7 +149,7 @@ public class UploadRepository {
      * @return
      */
     public boolean containsYear(String name) {
-        return categoriesModel.containsYear(name);
+        return categoriesModel.isSpammyCategory(name);
     }
 
     /**

app/src/test/kotlin/fr/free/nrw/commons/upload/UploadRepositoryUnitTest.kt

@@ -156,7 +156,7 @@ class UploadRepositoryUnitTest {
     @Test
     fun testContainsYear() {
         assertEquals(
-            repository.containsYear(""), categoriesModel.containsYear("")
+            repository.containsYear(""), categoriesModel.isSpammyCategory("")
         )
     }