Remove --prerelease switches from aspire CLI commands

[Copilot]

This PR removes the --prerelease switch from the aspire new and aspire add CLI commands while defaulting the prerelease parameter to true for internal API calls.

Changes

• Removed the --prerelease option from NewCommand
• Removed the --prerelease option from AddCommand
• Updated NuGetPackageCache and IDotNetCliRunner interfaces to default prerelease to true in method signatures
• Updated implementations to use the new default value
• Made the options parameter nullable in SearchPackagesAsync with appropriate handling
• Updated test fixtures to reflect these changes

This approach simplifies the CLI interface while ensuring that prerelease packages are included by default in searches, with the option to change this behavior in the future through the internal API if needed.

Fixes #9446.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)
• dnceng.pkgs.visualstudio.com
  • Triggering command: /home/REDACTED/work/aspire/aspire/.dotnet/dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj (dns block)
• pkgs.dev.azure.com
  • Triggering command: /home/REDACTED/work/aspire/aspire/.dotnet/dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[Copilot]

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