Add server-side support for CLI dependent choice validation

[tayfun-akguc]

• IsDynamic + DependsOnInputs on ResourceSnapshotCommandArgument so the CLI can tell dependent choices
• New backchannel capability aux.v4 and LoadDynamicArgumentOptionsAsync RPC
• Status enum + matching DTOs, registered in the CLI's JSON source-gen context

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #16907

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No

[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/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17218

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17218"

[tayfun-akguc]

@microsoft-github-policy-service agree

[sebastienros]

@davidfowl do you want to close this one?

[tayfun-akguc]

@sebastienros @davidfowl
I read @davidfowl's comment as confirming the repro, not pointing to an existing fix. Want me to continue here, or is there parallel work? Happy to close either way.

[davidfowl]

This is my draft pr #17249