[DSG] S3 data connection overwrites previously S3 data connection if present (partial fix)

Description of problem:

If user adds more than one S3 data connection to the same workbench, only the latest attached would be useable. It is happening because every S3 data connection the user adds will overwrite the same env variables in the workbench

Prerequisites (if any, like setup, operators/versions):

Create a Data science project

Create a workbench in the DS project

Steps to Reproduce

1. go to RHODS Dashboard > Data Science Projects
2. enter your project
3. create two S3 data connections
4. attach both the data connections to the same workbench
5. check the S3 secrets from the jupyter notebook

Actual results:

the S3 values stored in the env variables are the ones belonging to the second data connection

Expected results:

TBD 

example of solutions:

• using  some data structure like python dictionary in bash?
• inform user that only one S3 conenction can be added?
• ...

Reproducibility (Always/Intermittent/Only Once):

Awlays

Build Details:

tested using local deployment of dashboard. The same changes should be in build v1.19.0-3. I will check

Workaround:

Additional info: