[DSG] Unable to scale down GPUs in a workbench when all GPUs are in use

Description of problem:

It is not possible to scale down GPUs in a notebook if all the GPUs instance are occupied.

This happens regardless if the GPUs are occupied by the same workbench or others.

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

Create a DS Project

Deploy a GPU node (1 GPU used to reproduce this bug)

Steps to Reproduce

1. create and start a WB with 1 GPU
2. stop it
3. create a new WB with 1 GPU and launch it (you may need to wait a bit until the GPUs becomes available again after step 2)
4. edit the first WB to scale the GPU from 1 to 0 and launch it

        or

1. create and start a WB with 1 GPU
2. edit the WB to scale down the GPUs

*the issue should have a bigger impact in presence of multiple workbenches with multiple GPUs

Actual results:

it's not allowed to scale to 0 the GPU in order to launch the workbench

Expected results:

possible to scale down to 0 GPUs of a workbench

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

RHODS v1.22.0-2

Workaround:

• Stop all the running workbenches which are using the GPUs
• wait until the GPU availability is captured
• edit the workbench and scale down the GPU instances

Additional info: