Make the default home page a pattern so it can be switched back to

[scruffian]

Description

If we land WordPress/gutenberg#54609, we need a way for users to preview the original home template.

Screenshots

Testing Instructions

1. Checkout Add template replace flow to template inspector gutenberg#54609
2. Open the "Replace template" option
3. Confirm that you see the default template as well as the writer and portfolio ones.

Contributors

[MaggieCabrera]

I think you are missing files here :D

[scruffian]

you're right, added!

[carolinan]

We should do this regardless of whether the Gutenberg PR will be ready or not.
I am not convinced it is a good idea to include the feature in 6.4 since it is not complete and won't be tested in time, and I don't see a "blessing" from the release leads.

[luminuu]

We can try to escalate this to the release leads if it makes sense to do so.

[MaggieCabrera]

We can try to escalate this to the release leads if it makes sense to do so.

Yeah, since this release is so short, I think we can push for this to actually make it. If testing during beta reveals it's not ready, we can always pull it back

[luminuu]

Just noticed we have the linked issue to this PR already in our Gutenberg tracking issue, which has been blessed last week. So I hope we can get it in!

[MaggieCabrera]

I renamed the patterns for consistency, LGTM