[CANCEL][VOTE] Release Apache Paimon 2.0.0 and PyPaimon 2.0.0 (RC4)

[Jingsong Li <ji...@gmail.com>]

Hi everyone,

Please cancel the vote for Apache Paimon 2.0.0 and PyPaimon 2.0.0 RC4.

During follow-up verification, we found the following issues:

- The signed Paimon source archive contains tracked precompiled
hive-test-udfs.jar files. The source candidate should be source-only.
- The PyPaimon distributions omit pypaimon/sample/data/data.jsonl, so
the packaged sample is incomplete.
- The Java convenience artifacts were staged across four separate
Nexus repositories by the previous process. The updated process builds
and verifies one complete Maven repository image and stages it
atomically as a single repository.

These issues have been fixed on the release-2.0 branch. I will prepare
RC5 with the updated release workflow and publish a new vote.

Best,
Jingsong