[MBL-1720] Handle estimated shipping on the manage pledge screen

[ifosli]

📲 What

Show estimated shipping on the manage pledge screen and hide "shipping" if it's $0.

🛠 How

In order to work with our existing helpers, this fetches all the shipping rules for a reward using an extra api call. I also update tests, including deleting a couple tests that are checking specific view parameters (tested in snapshots anyways) and moving some snapshots to use orthogonal combos instead.

👀 See

Jira

Before 🐛	After 🦋

✅ Acceptance criteria

• Estimated shipping shows on manage pledge screen if flag is on and the project has estimated shipping
• If shipping cost is zero, shipping doesn't show on pledge screen. (I didn't flag guard this change because I think it makes sense outside of the pledge redemption flow, too - if it ever happens.)

⏰ TODO

• Check if I can move helper function to take in locationId instead of entire shipping rule. If so, I'll put up a separate pr that does that and simplifies everything
• We should test accessibility before launch, though I don't think that needs to block this pr.

[scottkicks]

LGTM 👍