[OptionList] inconsistent alignment of check boxes with ChoiceList

[jim-chou-shopify]

Issue summary

Closes https://github.com/Shopify/marketing-technology/issues/3973.

Currently, items that are two lines have the checkboxes vertically aligned to the middle of the text. They should be aligned to the top to be consistent with ChoiceList.

Expected behavior

Top align checkbox

Actual behavior

Steps to reproduce the problem

• Provide long text to option in OptionList

Reduced test case

https://codesandbox.io/embed/q544vm26w

Specifications

• Are you using the React components? (Y/N): Y
• Polaris version number: 3.12.0
• Browser: Chrome
• Device: Mac pro laptop

@supervee

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