Use NestedInstallerFiles for generating installer nodes in New Command

[mdanish-kh]

• [x] Have you signed the Contributor License Agreement?
• [x] Are you working against an Issue? Resolves #435. This is also one of the regressions from an earlier PR #415 (sorry 😢). New command for zip installers got broken since PackageParser now uses NestedInstallerFiles to generate installer nodes

https://github.com/microsoft/winget-create/blob/44a102acd07793d89be2c1bf5e135d04ae17488c/src/WingetCreateCore/Common/PackageParser.cs#L500

New command needs to be updated to populate the installerMetadata with NestedInstallerFiles now instead of RelativeFilePaths

Manifests to test with

wingetcreate new "https://download.sysinternals.com/files/ZoomIt.zip"

wingetcreate new "https://github.com/istio/istio/releases/download/1.17.3/istioctl-1.17.3-win.zip"

wingetcreate new "https://github.com/junegunn/fzf/releases/download/0.39.0/fzf-0.39.0-windows_amd64.zip"

wingetcreate new "https://github.com/sharkdp/fd/releases/download/v8.7.0/fd-v8.7.0-i686-pc-windows-msvc.zip"

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Microsoft Reviewers: codeflow:open?pullrequest=https://github.com/microsoft/winget-create/pull/434&drop=dogfoodAlpha

[ryfu-msft]

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