improve: add helpful source_software options to load_dataset errors

[dhruv1955]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other (error-message UX improvement + test enhancement)

Why is this PR needed?

When an unsupported source_software is passed to load_dataset, the previous error did not clearly guide users to valid values. This made debugging harder, especially for new users.

What does this PR do?

• Improves the ValueError message in load_dataset to include:
  • the invalid source_software value
  • a sorted list of supported options from the loader registry
• Updates unit tests to verify:
  • the refined error text (Unsupported source software)
  • presence of Supported options are:
  • presence of known valid loader names in the message

References

No linked issue for this PR.

How has this PR been tested?

• Ran lint checks on changed files with:
  • ruff check movement/io/load.py tests/test_unit/test_io/test_load.py
• Verified behavior locally by triggering load_dataset with an unknown source_software and confirming the new message includes supported options.
• Updated existing unit test coverage in tests/test_unit/test_io/test_load.py for the new error-message behavior.

Is this a breaking change?

No.
This change is backward-compatible and only improves error messaging and related test assertions.

Does this PR require an update to the documentation?

No.
There is no API or usage change; only error clarity is improved.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud