For multiple dimensions setups, fix alias handling and multihost publish path

For multiple dimensions setups, fix alias handling and multihost publish path

* The alias handling was left as is when we added new dimensions in v0.152.0, which meant that if you had `defaultContentVersionInSubDir=true` set, the alias page in the root would not be correctly created.
* Also, if you had multihost setup with multiple dimensions, the publish would be incorrect: The language key was added last instead of first.
* The home page alias handling is reworked and made more robust, which also fixes some subtle issues:

* It now supports redircects for multiple HTML output formats for the home page.
* We skip creating aliases for disabled home pages.
* With potentially multiple output formats with one of them canonical, we added a new  `Canonical` method to the `Page.OutputFormats`, which allows you to do this in a template:

```handlebars
{{ with .OutputFormats.Canonical }}<link rel="{{ .Rel }}" href="{{ .Permalink }}">{{ end }}
```

Fixes #14354
Fixes #14356