Introduce IceTipRepositoryStatusModel to avoid multiple commit lookups

[guillep]

Opening iceberg does a lot of commit lookups to show info on the browsers.
This in turn stresses a lot the GC and the ephemeron queue because all those commits are set as autorelease.

This change adds a description object where values can be cached per table.
This allows to go from 1111 to ~33 lookups in my testing environment.

[Ducasse]

@guillep what should we do? I can integrate this fix.

[jecisc]

Some tests are failing but I think they are just failing in P13 branch and got fixed in P14.

Should we integrate and port forward to P14?

[Ducasse]

@guillep @jecisc I would integrate this in P14. Is it ok?

[jecisc]

Yes let's merge.
I was waiting to see if we could have another review because the Iceberg model is still a little obscure to me. But it would be a shame to lose an improvement like this :)

[jecisc]

I have the impression that this broke a few things in Iceberg but I don't understand what is happening for now. I'll probably check this week

[jecisc]

I found the error but I need to discuss with Esteban and Guille because I think this is a Spec bug but we need to decide what is the right behavior

[jecisc]

I will revert this change for now because even with a fix in Spec, this is breaking the coloration in the repositories list

[jecisc]

Reverted in: 688b39d