Avoid directly calling version to avoid Sorbet error

[st0012]

Motivation

This will avoid breaking add-ons that don't define a version method and doesn't require ruby-lsp as a dependency when displaying the add-ons in the UI.

Implementation

Checks if the version method's owner if Addon. If it is, calling it would cause Sorbet to raise error so we avoid it. But if it's not, we call it to get the version.

Automated Tests

Updated existing test to cover both cases (defined and not defined).

Manual Tests