Substack importer: account for user skipping both steps

[simison]

Proposed Changes

• Adds a summary state when both content and subscriber importing were skipped. I don't think many people will end up at this screen, but if they do, now it's not a dead end at least.

Why are these changes being made?

Testing Instructions

• Test Substack importer
• Skip both content and subscriber importers
• Start over

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124779

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124779&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-124779&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug update/substack-importer-double-skip on your sandbox.

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~63 bytes added 📈 [gzipped])

name    parsed_size           gzip_size
import       +471 B  (+0.1%)      +63 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[simison]

@crisbusquets I made something quick that feels slightly clunky and could probably be better, but I'm also fine shipping as-is. Lemme know what you think! Screenshot in the PR description.

[crisbusquets]

Thanks for the ping, @simison !

I had a design proposal for this (ZdugJ99VXJszZRSBfMNre4-fi-5443_27320), which is exactly what you posted, but without the CTA.

I'd adjust the spacing and the icon and the font color to match with the flow. I had Gray 50 in the Figma file, to make it more distinct from the titles, Gray 70.