[I] Make the POLARIS_BOOTSTRAP_CREDENTIALS consistent across docker image, docker composer and gradle run [polaris]

[via GitHub]

flyrain opened a new issue, #1869:
URL: https://github.com/apache/polaris/issues/1869

   ### Describe the bug
   
   We got different setting for the local default. It causes issues like the 
docker run doesn't work with `./regtests/run_spark_sql.sh`. We should make it 
consistent across the project.
   ```
   POLARIS_BOOTSTRAP_CREDENTIALS: default-realm,root,s3cr3t
   ```
   ```
    "-Dpolaris.bootstrap.credentials=POLARIS,root,secret",
   ```
   
   ### To Reproduce
   
   _No response_
   
   ### Actual Behavior
   
   _No response_
   
   ### Expected Behavior
   
   _No response_
   
   ### Additional context
   
   _No response_
   
   ### System information
   
   _No response_


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