[cli] Add a status message for unchanged resources

[pgavlin]

These changes add a status message with the count of unchanged resources
to the lower-left corner of the display. This is useful as a measure of
progress for updates that are mostly free of changes.

[pgavlin]

Will grab an example screenshot or recording.

[pulumi-bot]

Changelog

[uncommitted] (2024-04-18)

[justinvp]

Nice. Looks reasonable to me. Bottom left seems like a reasonable place for it (though, I'm also curious if anyone has other ideas where it should be placed). I'd love to take this for a quick spin before merging it, but haven't had a chance to try it yet. Will try it out tomorrow.

[justinvp]

I tried this out with this example: pulumi new static-website-aws-go.

After the initial pulumi up, I run pulumi up again and get this:

Note the discrepancy between the "10 unchanged" for this new feature, and the existing "Resources" summary which says "8 unchanged".

Also, should we hide this at the end, since the summary already mentions how many unchanged resources there are? Or if not hiding it, adding some line spaces between the tree and the "Resources:"?

When I do run the update, then the numbers agree. But still wondering if it should be hidden):

[pgavlin]

Note the discrepancy between the "10 unchanged" for this new feature, and the existing "Resources" summary which says "8 unchanged".

Yeah that's odd. Definitely want these to agree.

Also, should we hide this at the end, since the summary already mentions how many unchanged resources there are? Or if not hiding it, adding some line spaces between the tree and the "Resources:"?

Yes, definitely.