Add rad app show/list/delete --preview

[lakshmimsft]

Adds --preview flag support to rad app show, rad app list, and rad app delete commands. When --preview is passed, these commands operate against Radius.Core/applications resources via the v20250801preview API surface, instead of the default Applications.Core/applications resource type. The pr also adds comprehensive tests for the preview rad app list command in pkg/cli/cmd/app/list/preview/list_test.go, covering validation, output, and error handling.

Type of change

• This pull request adds or changes features of Radius and has an approved issue ( rad app commands don't work for applications created by Radius.Core/applications type #11675).

Fixes: Part of #11675

Contributor checklist

Please verify that the PR meets the following requirements, where applicable:

• An overview of proposed schema changes is included in a linked GitHub issue.
  • Yes
  • Not applicable
• A design document is added or updated under eng/design-notes/ in this repository, if new APIs are being introduced.
  • Yes
  • Not applicable
• The design document has been reviewed and approved by Radius maintainers/approvers.
  • Yes
  • Not applicable
• A PR for resource-types-contrib is created, if resource types or recipes are affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for dashboard is created, if the Radius Dashboard is affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for the documentation repository is created, if the changes in this PR affect the documentation or any user facing updates are made.
  • Yes
  • Not applicable

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[Copilot]

Pull request overview

Adds --preview support for selected rad app commands so they can operate on Radius.Core/applications using the v20250801preview API surface.

Changes:

• Adds preview implementations for rad app show, rad app list, and rad app delete.
• Wires the preview implementations behind the existing commands via --preview.
• Adds Radius.Core application fake client support and tests for preview app commands.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cmd/rad/cmd/root.go	Wires preview app delete/list/show command routing.
pkg/cli/test_client_factory/radius_core.go	Adds fake ApplicationsServer support for Radius.Core tests.
pkg/cli/cmd/app/show/preview/show.go	Adds preview app show runner.
pkg/cli/cmd/app/show/preview/show_test.go	Tests preview app show behavior.
pkg/cli/cmd/app/list/preview/list.go	Adds preview app list runner.
pkg/cli/cmd/app/list/preview/list_test.go	Tests preview app list behavior.
pkg/cli/cmd/app/delete/preview/delete.go	Adds preview app delete runner and resource cleanup logic.
pkg/cli/cmd/app/delete/preview/delete_test.go	Tests preview app delete behavior.

[github-actions]

Unit Tests

    2 files  ± 0    429 suites  +6   7m 25s ⏱️ +2s
5 185 tests +40  5 183 ✅ +40  2 💤 ±0  0 ❌ ±0 
6 263 runs  +80  6 261 ✅ +80  2 💤 ±0  0 ❌ ±0 

Results for commit 21613c9. ± Comparison against base commit c2049c9.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 65.79926% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.79%. Comparing base (c2049c9) to head (21613c9).

Files with missing lines	Patch %	Lines
pkg/cli/test_client_factory/radius_core.go	0.00%	40 Missing ⚠️
pkg/cli/cmd/app/delete/preview/delete.go	75.80%	17 Missing and 13 partials ⚠️
pkg/cli/cmd/app/show/preview/show.go	75.47%	8 Missing and 5 partials ⚠️
pkg/cli/cmd/app/list/preview/list.go	80.43%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11935      +/-   ##
==========================================
+ Coverage   51.71%   51.79%   +0.08%     
==========================================
  Files         725      728       +3     
  Lines       45629    45897     +268     
==========================================
+ Hits        23595    23772     +177     
- Misses      19791    19861      +70     
- Partials     2243     2264      +21     

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[radius-functional-tests]

Radius functional test overview

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Click here to see the test run details

Name	Value
Repository	radius-project/radius
Commit ref	21613c9
Unique ID	funcc2f7db34e5
Image tag	pr-funcc2f7db34e5

• gotestsum 1.13.0
• KinD: v0.29.0
• Dapr: 1.14.4
• Azure KeyVault CSI driver: 1.4.2
• Azure Workload identity webhook: 1.3.0
• Bicep recipe location ghcr.io/radius-project/dev/test/testrecipes/test-bicep-recipes/<name>:pr-funcc2f7db34e5
• Terraform recipe location http://tf-module-server.radius-test-tf-module-server.svc.cluster.local/<name>.zip (in cluster)
• applications-rp test image location: ghcr.io/radius-project/dev/applications-rp:pr-funcc2f7db34e5
• dynamic-rp test image location: ghcr.io/radius-project/dev/dynamic-rp:pr-funcc2f7db34e5
• controller test image location: ghcr.io/radius-project/dev/controller:pr-funcc2f7db34e5
• ucp test image location: ghcr.io/radius-project/dev/ucpd:pr-funcc2f7db34e5
• deployment-engine test image location: ghcr.io/radius-project/deployment-engine:latest

Test Status

⌛ Building Radius and pushing container images for functional tests...
✅ Container images build succeeded
⌛ Publishing Bicep Recipes for functional tests...
✅ Recipe publishing succeeded
⌛ Starting ucp-cloud functional tests...
⌛ Starting corerp-cloud functional tests...
✅ ucp-cloud functional tests succeeded
✅ corerp-cloud functional tests succeeded