fix: Removes plmnid parameter from subscriber creation

[saltiyazan]

Description

fix: Removes plmnid parameter from subscriber creation. The parameter is not used by the webui when creating a subscriber, it is calculated later using mcc and mnc

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that validate the behaviour of the software
• [ ] I validated that new and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have bumped the version of the library