Make ignoreLinesStartingWith varargs (#2691)

It still is a list, because we String::startsWith does not benefit from
the target being in a set.

db/src/test/java/google/registry/sql/flyway/SchemaTest.java

@@ -115,7 +115,7 @@ class SchemaTest {
             Joiner.on(File.separatorChar).join(MOUNTED_RESOURCE_PATH, DUMP_OUTPUT_FILE));
 
     assertThat(dumpedSchema)
-        .ignoringLinesThatStartWith("--")
+        .ignoringLinesStartingWith("--")
         .hasSameContentAs(Resources.getResource("sql/schema/nomulus.golden.sql"));
   }