[Bug] cosn FileSystem plugin jar error

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Paimon version

paimon 1.1.0 1.1.1

The downloaded paimon-cosn JAR from https://repo.maven.apache.org/maven2/org/apache/paimon/paimon-cosn/ has an issue:
​​The services directory should be under META-INF, but it currently exists as META-INF.services, causing the failure to locate the cosn filesystem.​

The following error occurred while configuring the COSN catalog

### Compute Engine

flink 1.19

### Minimal reproduce step

### What doesn't meet your expectations?

COSN is unavailable

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Inspect the paimon-cosn artifact packaging and the service descriptor responsible for COSN filesystem discovery; the reported JAR layout is the starting point. Reproduce with Paimon 1.1.0 or 1.1.1 and Flink 1.19, then verify that the service entry is packaged under META-INF/services and COSN can be located.

Written by the indexing model from the issue text.