Merge similar error types
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Issue body
### What needs to get done
`InvalidSourceOption` and `InvalidSourceOptions` should be merged into a singular error type.
### Why it needs to get done
Spawned from the following TODO comment:
https://github.com/canonical/craft-parts/blob/a20b49d1b27ecd00ab74eb786d0f2403184adc97/craft_parts/sources/errors.py#L67
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