Fix rad app list to filter by workspace default environment

[Copilot]

Description

rad app list documentation claimed it lists applications "in the resource group associated with the default environment" but ignored the workspace's Environment field entirely, returning all applications in the resource group.

Changes

Core fix (pkg/cli/cmd/app/list/list.go):

• Filter applications by workspace.Environment in Run() method
• Added filterApplicationsByEnvironment() to compare app.Properties.Environment against workspace setting
• Added matchesEnvironment() with flexible matching:
  • Exact match for full resource IDs
  • Suffix match for environment names (e.g., "dev" matches .../environments/dev)
• Backward compatible: no filtering when workspace.Environment is empty

Tests (pkg/cli/cmd/app/list/list_test.go):

• Test_filterApplicationsByEnvironment() - filtering scenarios including nil properties
• Test_matchesEnvironment() - ID/name matching logic
• Test_Run_WithEnvironmentFiltering() - end-to-end with environment set

Example

// Before: Lists apps from all environments regardless of workspace.Environment
apps, _ := client.ListApplications(ctx)
return output.WriteFormatted(format, apps, tableFormat)

// After: Filters to workspace's default environment when set
apps, _ := client.ListApplications(ctx)
if workspace.Environment != "" {
    apps = filterApplicationsByEnvironment(apps, workspace.Environment)
}
return output.WriteFormatted(format, apps, tableFormat)

Type of change

• This pull request fixes a bug in Radius and has an approved issue (issue link required).

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.
  • Not applicable
• A design document PR is created in the design-notes repository, if new APIs are being introduced.
  • Not applicable
• The design document has been reviewed and approved by Radius maintainers/approvers.
  • Not applicable
• A PR for the samples repository is created, if existing samples are affected by the changes in this PR.
  • 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.
  • Not applicable
• A PR for the recipes repository is created, if existing recipes are affected by the changes in this PR.
  • Not applicable

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