[fix](fe) Preload paimon jindo for paimon scanner (#62350)

`paimon-scanner` runs under a dedicated scanner classloader, while
`preload-extensions` is loaded from the parent classpath with higher
priority. Doris currently uses parent-first classloading for
  scanner jars.

When `paimon-jindo` is packaged only inside `paimon-scanner`, runtime
may still resolve `org.apache.paimon.*` classes from the parent
classpath first. In this case, the Paimon `FileIO`/
`ServiceLoader` view seen at runtime is split across different
classloaders, and the Jindo file IO loader is not discovered correctly.
This can lead to errors like:

`org.apache.paimon.fs.UnsupportedSchemeException: Could not find a file
io implementation for scheme 'oss'`

This PR removes `paimon-jindo` from `paimon-scanner` and moves it to
`preload-extensions`, so the Jindo FileIO implementation is available
from the highest-priority parent classpath and stays
  consistent with the Paimon core classes used during scanner execution.

This keeps the runtime dependency layout aligned with Doris' existing
classloading model and avoids scanner-local plugin jars being hidden by
parent-first resolution.

Author: CalvinKirs

fe/be-java-extensions/paimon-scanner/pom.xml

@@ -60,10 +60,6 @@ under the License.
             <groupId>org.apache.paimon</groupId>
             <artifactId>paimon-format</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.apache.paimon</groupId>
-            <artifactId>paimon-jindo</artifactId>
-        </dependency>
 
     </dependencies>
 

fe/be-java-extensions/preload-extensions/pom.xml

@@ -83,6 +83,11 @@ under the License.
             <groupId>org.apache.paimon</groupId>
             <artifactId>paimon-s3</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>org.apache.paimon</groupId>
+            <artifactId>paimon-jindo</artifactId>
+        </dependency>
         <!-- For Avro and Hudi Scanner PreLoad -->
         <dependency>
             <groupId>org.apache.hadoop</groupId>