Make NetworkIdentifier a record to allow for non-breaking additions in future releases

[karolz-ms]

No description provided.

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 12688

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12688"

[karolz-ms]

@copilot please create a backport PR for this into release/13.0 branch

[Copilot]

@karolz-ms I've opened a new pull request, #12689, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

Pull Request Overview

This PR changes NetworkIdentifier from a readonly record struct (value type) to a record class (reference type).

Key Changes

• Converted NetworkIdentifier from readonly record struct to record (class)

[karolz-ms]

/backport to release/13.0

[github-actions]

Started backporting to release/13.0: https://github.com/dotnet/aspire/actions/runs/19088540817