refactor(api): Delete obsolete todo comments

[SyntaxColoring]

Overview

Delete some todo comments in the loadLabware and loadLid Protocol Engine command implementations.

Emphasis mine:

these validation checks happen after the labware is loaded, because they rely on the definition. In practice this will not cause any issues since they will raise protocol ending exception, but for correctness should be refactored to do this check beforehand.

As far as I can tell, this is not true. These checks happen inside Protocol Engine command implementations, which, architecturally, commit all their changes only at the very end, once they've completed without errors.

These comments may have been inherited from opentrons.protocol_api-level code, which does still have this problem. They may also have been inherited from older hacky Protocol Engine code that did directly modify state in the middle of a command, code that I believe and hope we've stamped out by now.

Test Plan and Hands on Testing

None needed.

Review requests

Am I correct, or is there something weird about these commands where they do modify Protocol Engine state before they complete?

Risk assessment

No risk.

[sfoster1]

No, I think you're right. I think equipment.load_labware used to also emplace the labware in the state store and no longer does.