[pom] prefer central repo for releases; limit apache-snapshots to snapshots

[adoroszlai]

Purpose

• Avoid trying to download release artifacts from Apache snapshot repo.
• Add central repo to ensure it's preferred to repository.apache.org when downloading release artifacts.

Tests

Uncommented the <repositories> section, and built locally.

$ mvn -DskipTests clean package
...
[INFO] ------------------< org.apache.paimon:paimon-parent >-------------------
[INFO] Building Paimon : 1.0-SNAPSHOT                                    [1/52]
[INFO]   from pom.xml
[INFO] --------------------------------[ pom ]---------------------------------
Downloading from central: https://repo.maven.apache.org/maven2/com/diffplug/spotless/spotless-maven-plugin/2.13.0/spotless-maven-plugin-2.13.0.pom
Downloaded from central: https://repo.maven.apache.org/maven2/com/diffplug/spotless/spotless-maven-plugin/2.13.0/spotless-maven-plugin-2.13.0.pom (3.2 kB at 17 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/com/diffplug/spotless/spotless-maven-plugin/2.13.0/spotless-maven-plugin-2.13.0.jar
Downloaded from central: https://repo.maven.apache.org/maven2/com/diffplug/spotless/spotless-maven-plugin/2.13.0/spotless-maven-plugin-2.13.0.jar (65 kB at 204 kB/s)
...
[INFO] Reactor Summary for Paimon : 1.0-SNAPSHOT:
...
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  17:29 min

[JingsongLi]

+1

[adoroszlai]

Thanks @JingsongLi for reviewing and merging this.