fix: task create now returns a single task object

[AncientPatata]

Motivation

task create would return a list with a single task object

Description

• task create now returns a singular task object instead
• changed test to work with the error handler (since it uses click exceptions, it doesn't close with a failing exit code)
• changed the return type of reformat_cmd_output from str to Union[str, Dict[str, Any]]

Testing

Unit tests pass

Impact

Small improvements towards a better and more consistent tool.

Additional Information

This requires the changes from #38 for tests to pass

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• I have thoroughly tested my modifications and added tests when necessary.
• Tests pass locally and in the CI.
• I have assessed the performance impact of my modifications.