Add Mailing view and preview paths to schema

[larssandergreen]

Overview

Would be nice to have more than just the Edit option in SearchKit.

Before

After

Adds View for the Mailing Report and Preview for the mailing content.

Technical Details

Of course, these links will or won't work depending on the state of the mailing (draft versus scheduled), but better to have them than to not. I don't think there's a way to show or not show them depending on the particular mailing (@colemanw please correct me if I'm wrong).

I tried to add Delete as well, but it turns out that Mailing Delete uses civicrm/mailing/browse which uses an onclick confirmation for deletion, which I don't think we can use with just a path, so that would require some additional work and I'll leave that for another day.

[civibot]

(Standard links)

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[colemanw]

This looks good @larssandergreen but regenerating civicrm_generated is not necessary when simply adding tags like this. You can remove that commit like

git reset --hard HEAD~1&&git push -f

To your other question, yes! SearchKit allows conditional rules for links. You can't define that in the schema though, it has to be configured when you are making a SearchDisplay.

[larssandergreen]

@colemanw Great, thanks, have done.