Fix handling of integers in AutoIntParamType

[mryab]

The current implementation of AutoIntParamType.convert returns integers only when integers are passed as value. However, value is defined as a string, so this branch of the code never gets used. As a result, passing --batch-size 16 (or any other integer) to the command for creating jobs fails with the following error:

Error: Invalid value for '--batch-size': Invalid integer value: {value}

This PR fixes that error, moving over the code to handle integer inputs correctly from Click