rad CLI enhancements

[willtsai]

Overview of roadmap item

Address some of the known functionality gaps in rad CLI (e.g. lack of credential validation, environment scoped operations, etc.)

Related issues

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1. rad recipe register and rad recipe show case sensitivity for --link-type radius#6314
   help wanted +1
2. https://github.com/radius-project/core-team/issues/768
3. Add rad CLI to winget radius#6617
   cli triaged +2
4. CLI Operations like list, show, delete, etc need to consider data in all resource groups. The user can be more specific if they desire. radius#6829
   +0
   
5. Decouple rad list command for new connectors from typed CLIs radius#2620
   cli triaged +2
   
6. Document Helm chart values docs#318
   public-release triaged +2
7. flaky test TEST_CLI radius#3232
   important triaged +2
   
8. Flaky test: Test_CLI_Delete - Failed to validate resource of type pods with labels map[radapp.io/application:kubernetes-cli-with-resources radapp.io/resource:containerb-app-with-resources] radius#6872
   flaky-test test-failure triaged +3
9. Loading indicator in CLI radius#5972
   good first issue +1
10. Radius CLI as Devcontainer feature radius#6906
    feature triaged +2
    
11. Remove "current group": The rad CLI stores a "current resource group" which is used for most operations that call the Radius API. radius#6828
    triaged +1
    
12. and more...

Additional context