Remove usages of 1es-official.yml and 1es-unofficial.yml pipeline templates

https://github.com/dotnet/docker-tools/pull/1771 added the new [1es.yml](https://github.com/dotnet/docker-tools/blob/main/eng/docker-tools/templates/1es.yml) template which automatically selects between the 1ES official and unofficial pipeline templates based on the pipeline name. If the pipeline name contains `-official`, it will use the official template, otherwise it will use the unofficial template.

Using this new template has the benefit of eliminating duplicated configurations between official and unofficial templates. References to the old 1es-official.yml and 1es-unofficial.yml templates should be removed and replaced with the new 1es.yml template. Special care should be taken to ensure the pipelines are properly named in order to select the correct template.