Store creation: add support CTA to applicable screens

[jaclync]

Part of #8538

Description

From p1670931902787739/1670929798.889469-slack-C045CUK1Y3U, we want to make it easier for users to contact support during the store creation flow. We're adding a ❓ icon to the navigation bar trailing edge to screens that don't have a trailing bar button - store name, country selector, domain selector, and store summary.

I created a SwiftUI view SupportButton to show as a ToolbarItem at the trailing edge of the navigation bar in the 4 screens with some refactoring on the related code. A new image helpOutline is added following the Android implementation.

Please note that I'm clarifying two points on this UX change p1672818334782819-slack-C045CUK1Y3U, there might be some changes after the decision is made.

Testing instructions

• Log in if needed
• Go to the Menu tab, and tap Switch store
• On the store picker, tap + Add a store
• Tap Create a new store --> the store name form should be shown with a support CTA on the top right of the navigation bar
• Tap on the icon to submit a support ticket --> the Zendesk ticket should have the tag origin:store-creation (make sure to note that the ticket is only for testing since we don't have permission to close them in Zendesk)
• Go back and enter a store name, then tap Continue --> the category question should be shown without a support CTA
• Tap Continue to skip --> the selling status question should be shown without a support CTA
• Tap Continue to skip --> the country question should be shown with a support CTA on the top right of the navigation bar
• Tap on the icon to submit a support ticket --> the Zendesk ticket should have the tag origin:store-creation
• Go back and select an option, then tap Continue --> the domain selector should be shown with a support CTA on the top right of the navigation bar
• Tap on the icon to submit a support ticket --> the Zendesk ticket should have the tag origin:store-creation
• Go back and select a domain, then tap Continue --> the summary screen should be shown with a support CTA on the top right of the navigation bar
• Tap on the icon to submit a support ticket --> the Zendesk ticket should have the tag origin:store-creation

Screenshots

store name	country selector	domain selector	store summary

---

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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[wpmobilebot]

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[itsmeichigo]

LGTM