Improve Developer CLI error handling for prerequisites and Azure subs…

…cription validation (#665)

### Summary & Motivation

Fix an issue in the Developer CLI where missing prerequisites (e.g.,
NodeJS) resulted in the CLI exiting without any error message. The CLI
now correctly identifies missing prerequisites and displays an error
such as: `NodeJS of minimum version 25.3.0 should be installed.`

Additionally, a validation has been added to the
`configure-continuous-deployments` CLI command to ensure that the
selected Azure subscriptions for staging and production belong to the
same tenant, preventing configuration errors.

### Checklist

- [x] I have added tests, or done manual regression tests
- [x] I have updated the documentation, if necessary

developer-cli/Commands/ConfigureContinuousDeploymentsCommand.cs

@@ -242,6 +242,14 @@ private void SelectAzureSubscriptions()
         Config.StagingSubscription = SelectSubscription("Staging");
         Config.ProductionSubscription = SelectSubscription("Production");
 
+        if(Config.StagingSubscription.TenantId != Config.ProductionSubscription.TenantId)
+        {
+            AnsiConsole.MarkupLine($"[red]ERROR:[/] Please select two subscriptions from the same tenant, and try again.");
+            Environment.Exit(1);
+        }
+
+        RunAzureCliCommand($"""account set --subscription "{Config.StagingSubscription.Id}" """);
+
         return;
 
         Subscription SelectSubscription(string environmentName)

developer-cli/Installation/Prerequisite.cs

@@ -36,7 +36,8 @@ protected override bool IsValid()
                 Arguments = Command,
                 RedirectStandardOutput = true,
                 RedirectStandardError = true
-            }
+            },
+            exitOnError: false
         );
 
         var possibleFileLocations = checkOutput.Split(Environment.NewLine);