Hide staging channel from aspire update --self when feature flag is disabled

[Copilot]

Description

aspire update --self unconditionally offered "staging" in the channel selection prompt, regardless of the stagingChannelEnabled feature flag. Selecting it without the flag would fail since no staging channel exists.

The fix checks _features.IsFeatureEnabled(KnownFeatures.StagingChannelEnabled) before including staging in the prompt choices — consistent with how the channel option description and PackagingService.GetChannelsAsync already gate on this flag.

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
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
  • No
• Does the change require an update in our Aspire docs?
  • Yes
  • No

Original prompt

---

This section details on the original issue you should resolve

<issue_title>If the staging feature flag isnt set, we shouldn't offer staging as an option in aspire update --self</issue_title>
<issue_description>### Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Without the staging feature flag set, aspire update --self fails saying no staging channel can be found. We should not show staging as an option if the feature flag isn't set.

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version info

No response

Anything else?

No response</issue_description>

<agent_instructions>Use the feature flag to do this.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes If the staging feature flag isnt set, we shouldn't offer staging as an option in aspire update --self #14648

---

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[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 -- 14675

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 14675"

[Copilot]

Pull request overview

This PR fixes aspire update --self so that the interactive channel selection prompt only offers the staging channel when the stagingChannelEnabled feature flag is enabled, preventing users from selecting an unavailable channel.

Changes:

• Gate the self-update prompt’s channel list on KnownFeatures.StagingChannelEnabled.
• Add unit tests covering both “staging enabled” and “staging disabled” prompt behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Aspire.Cli/Commands/UpdateCommand.cs	Conditionally includes staging in the self-update channel selection prompt based on the feature flag.
tests/Aspire.Cli.Tests/Commands/UpdateCommandTests.cs	Adds tests asserting the prompt includes/excludes staging depending on whether the feature is enabled.

[davidfowl]

/backport to release/13.2

[github-actions]

Started backporting to release/13.2: https://github.com/dotnet/aspire/actions/runs/22749767187