Ability to specify a default installer type in the manifest

Description of the new feature / enhancement

If two or more installers are equally suitable in terms of architecture, scope and other parameters etc, there should be a way to specify a default installer type for fresh install scenarios in the manifest. WinGet's current behavior relies on the ordering of the installers in the manifest, where WinGet selects whichever matching installer appears first. I'm aware of --installer-type but the average user would want to have the best experience with default args

Example

As reported in https://github.com/microsoft/winget-pkgs/issues/125309, the manifest contains both portable and nullsoft installers that are equal in terms of arch, scope etc. In fresh install flow, winget selects the installer that is defined first in the manifest. Re-ordering the manifest would make it choose the other installer.

Steps to reproduce to verify that behavior would be:

1. Locally clone winget-pkgs and install Streetwriters.Notesnook
   winget install -m manifests/s/Streetwriters/Notesnook/2.4.0

   Notice it selects the portable installer (defined earlier in the manifest)

2. Re-order the installer nodes

3. Install the manifest locally again. Notice it will select the nullsoft installer this time.

Proposed technical implementation details

No response

Start with the local Streetwriters.Notesnook manifest and the existing --installer-type behavior, then reproduce installer selection with the winget install -m command while reordering installer nodes. Done means a manifest can specify a preferred installer type and fresh installs consistently select it when installers otherwise match.