[Bug] [Seatunnel-web] Seatunnel-web always requires the cluster name to be seatunnel

[arshadmohammad]

Purpose of this pull request

Problem:
Seatunnel-web always requires the cluster name to be "seatunnel"
I configured "cluster-name: seatunnel-test" in hazelcast.yaml and also added "cluster-name: seatunnel-test" in hazelcast-client.yaml in seatunnel-web config, job execution was failing.

Proposal:
Remove the hard coding of cluster name. Read the cluster name from hazelcast-client.yam

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs

[davidzollo]

+1

[arshadmohammad]

Thanks @davidzollo for reviewing and merging the PR.

[Hisoka-X]

Thanks @arshadmohammad !