Move entire free campaign stepper into a `Form` component (setup & edit)

[tomalec]

This is a follow-up from #422 (comment)

The states that we have here [in EditFreeCampaign] essentially serve the same purpose as the form state, we can pull the <Form> component up and wrap the stepper component (see setup ads flow for example reference), then we don't need to have these local states. It would help us save some unnecessary callbacks (i.e. we don't need to pass down those onSettingsChange, onShippingRatesChange and onShippingTimesChange because they would all be in the form's onChange) and unnecessary re-renders.

Technical

We could make a code tad shorter and more readable if we move. We could make <Stepper> Component inside <Form> that would make all steps act as a single form. This should allow us to get rid of duplicated state management and unnecessary on*Change callbacks and workarounds for unitialValues.

Figma link

n/a

Acceptance criteria

• End-user behavior should not be impaired
• The end code should be shorter/easier to maintain and less redundant.

Unknowns

• We could make that change together with refactoring setup code to use shared component, to introduce it in both places at once, and to limit the amount of manual testing to avoid regression issues.

Out of bounds/rabbit holes

• <Form> component seems to be not well documented and tested, so we may end up using unmaintained features or rely on bugs as on features.

Event tracking

n/a

[eason9487]

After two years of evolution, the onboarding process has been changed in a number of ways

1. The audiences selection and shipping settings have been merged as the second step - Configure product listings
2. Added merchant contact information and Pre-Launch Checklist as the third step - Confirm store requirements
3. Added campaign setup as the new last step - Complete your campaign
4. The form code within EditFreeCampaign has been mostly deduplicated by the shared SetupFreeListings component in Free Listings + Paid Ads: Combine the audience and shipping steps #1616

With the first change, the free listings editing page also no longer has multiple steps

Suggestion

Based on the above context, I would consider that moving the stepper into the form of free listings is no longer in need and suggest closing this issue.

[tomalec]

Thanks for the great summary and for revisiting the old issue.