[PR] [#4718] fix(iceberg): use unified logic to transform catalog backend name to handle the renaming of catalog [gravitino]

[via GitHub]

github-actions[bot] opened a new pull request, #4986:
URL: https://github.com/apache/gravitino/pull/4986

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   ### What changes were proposed in this pull request?
   
   1. Spark,Trino, Iceberg catalog and Iceberg REST server use  
`getCatalogBackendName` to get catalog backend name.
   2. change the default backend name to catalog backend, like `jdbc`, it will 
not change after rename.
   
   ### Why are the changes needed?
   
   Fix: #4718 
   
   ### Does this PR introduce _any_ user-facing change?
   Yes
   
   ### How was this patch tested?
   1. create a jdbc catalog with catalog backend name, check whether can see 
the schema after rename
   1. create a jdbc catalog without catalog backend name, check whether can see 
the schema after rename
   
   


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