Make a function for adding lab custom losses

[jgsdavies]

📝 Description of the feature

To add a custom loss in lab from scripting requires modifying array length variables and appending to arrays. Create 2 functions to make this easier e.g.

💡 Steps for implementing the feature

• implement for internal
• implement for external
• Functions should include add/remove/clear

Functions can live in src/ansys/motorcad/core/methods/rpc_methods_utility.py

🔗 Useful links and references

No response

[sarah-r-woodrow]

good first task for Shreya