[Bug] [Connector-V2] Cannot specify custom OAuth2 URI on Iceberg REST Catalog

[LuigiDurso]

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• I had searched in the issues and found no similar issues.

What happened

I'm experiencing an issue with SeaTunnel's Iceberg connector when trying to specify a custom OAuth2 URI with REST catalog type. The connector doesn't appear to support custom OAuth2 URI configuration for Iceberg REST Catalog.

SeaTunnel Version

2.3.11

SeaTunnel Config

sink {
  Iceberg {
    catalog_name = "iceberg"
    
    // Nessie catalog properties
    iceberg.catalog.config = {
      uri = "http://nessie:19120/iceberg/main"
      catalog-impl = "org.apache.iceberg.rest.RESTCatalog"
      warehouse = "s3://***/"
      s3.endpoint="http://minio:9000"
      s3.region="us-east-1"
      s3.path-style-access=true
      s3.aws-access-key="***"
      s3.aws-secret-key="***"

      // OAuth2 configuration attempts
      rest.oauth2.token-uri = "https://my-custom-auth-server/oauth/token" // This doesn't work
      rest.client.id = "my-client-id"
      rest.client.secret = "my-client-secret"
    }
    
    namespace = "demo"
    table = "fake_data_table"
  }
}

Running Command

curl --location 'http://127.0.0.1:9090/submit-job/upload' --form 'config_file=@"/***/config/fake-to-iceberg-nessie.conf"'

Error Exception

Try to connect to oauth/token with URI of Nessie Api.

Zeta or Flink or Spark Version

No response

Java or Scala Version

No response

Screenshots

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Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[LuigiDurso]

After iceberg dep update from 1.4.2 to 1.6.1 i can specify oauth uri with following config:

`Iceberg {
source_table_name = "xxx"
# Iceberg catalog configuration using Nessie
catalog_type = "nessie"
catalog_name = "iceberg"
table = "xxx"

# Nessie catalog properties
iceberg.catalog.config = {
  type = "rest"
  uri = "http://nessie:19120/iceberg/main"
  warehouse = "s3://xxx/"
  io-impl = "org.apache.iceberg.aws.s3.S3FileIO"
  
  // S3 configuration for warehouse storage
  s3.endpoint = "http://nessie:9000"
  s3.access-key-id = "xxx"
  s3.secret-access-key = "xxx"

  // Oauth configuration for Rest catalog
  oauth2-server-uri = "http://keycloak:8080/realms/iceberg/protocol/openid-connect/token"
  credential = "client1:s3cr3t"
}`

PR: #9451