chore: Apply application layout to register snap page

[steverydz]

Done

Converts register snap page to React and includes in the publisher pages app

How to QA

• Go to https://snapcraft-io-5064.demos.haus/register-snap
• Try to register a snap you already own
• Check that you get a notification to say you already own it
• Try to register an existing snap you don't own
• Check that you get a notification to say it's already owned
• Try to register a snap in the global store
• Check that there is a notification saying it has been submitted for review
• Try to register a snap in "Canonical Web Team Test Store"
• Check that you are redirected to /snaps when complete

Testing

• This PR has tests
• No testing required (explain why):

Issue / Card

Fixes https://warthogs.atlassian.net/browse/WD-19646

[webteam-app]

Demo

Jenkins

demos.haus

[abbiesims]

I'm not being redirected to /snaps after registering a snap in Canonical Web Team Test Store. It doesn't look like it's registering

[bartaz]

When I try to register a name I already know, notification shows correctly that I own it and the name is linked. But clicking on the link leads to 404 page (https://snapcraft-io-5064.demos.haus/bartaz-test/listing)

But if I find that name on my snaps list, and click link there, it loads correctly (at the same URL): https://snapcraft-io-5064.demos.haus/bartaz-test/listing

So it seems like the route works fine inside react app, but when linked to not via router it doesn't load correct template or something?

Edit: the name is registered, but no snap has been published under that name yet (if that matters).

[steverydz]

@bartaz I've added a change we discussed where there is a notification if for some reason the listing endpoint fails. Could you please re-review?

[bartaz]

Thanks for the updates, looks good.