[Improvement] [Seatunnel-web] Improve code in DatasourceServiceImpl,SeaTunnelEngineMetricsExtractor etc.

[arshadmohammad]

Renamed JobExecParamUtil and JobUtils.
Removed exta db call in DatasourceServiceImpl
Removed suplicate codes from SeaTunnelEngineMetricsExtractor, and DatasourceServiceImpl
Removed redunant code to set cluster name

Purpose of this pull request

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

[arshadmohammad]

Build, installed, created a job and executed the job.