Remove annotation for returning tuple

Prerequisites

[x] Reviewed the checklist
[x] Reviewed feedback from the "Sonar Cloud" bot. Note that you have to wait for the "CI / Unit Tests") to complete first. Failed Unit tests can be debugged by adding the label "verbose logging" to the GitHub PR.

Description of the Change

Removed an annotation in constellation_client. This was causing issues on the Linux machine, because it was running an old version of python. To remedy, a better description of the function and the expected return types were added in a comment above the function.

Alternate Designs

N/A

Why Should This Be In Core?

N/A

Benefits

Script works on old python versions

Possible Drawbacks

None

Verification Process

Open consty,
Tools -> Start Jupyter Notebook
Import constellation_client
Observe no errors are thrown when importing

Applicable Issues

https://github.com/constellation-app/constellation/issues/2176

constellation-app / constellation

Remove annotation for returning tuple #2177