Add missing namespace to CertificateAuthorityCollectionResource

[danegsta]

Description

CertificateAuthorityCollectionResource was missing a namespace.

[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 -- 12639

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12639"

[Copilot]

Pull Request Overview

This PR modernizes the namespace declaration in the CertificateAuthorityCollectionResource.cs file by converting from a using directive to a file-scoped namespace declaration, which is the preferred style according to the project's coding guidelines.

Key Changes

• Removed the using Aspire.Hosting.ApplicationModel; directive (which was redundant since the file is already in that namespace)
• Added a file-scoped namespace declaration namespace Aspire.Hosting.ApplicationModel;
• Added a blank line after the using statements for proper formatting

[danegsta]

/backport to release/13.0

[github-actions]

Started backporting to release/13.0: https://github.com/dotnet/aspire/actions/runs/19051929474