Shows region being used when starting sandbox (#2486)

* adds region on sandbox start

* change set

Author: ykethan

.changeset/thirty-weeks-whisper.md

@@ -0,0 +1,5 @@
+---
+'@aws-amplify/sandbox': patch
+---
+
+shows region on sandbox start

packages/sandbox/src/file_watching_sandbox.test.ts

@@ -353,20 +353,39 @@ void describe('Sandbox using local project name resolver', () => {
       undefined,
       false
     ));
-    assert.strictEqual(printer.log.mock.callCount(), 7);
+    assert.strictEqual(printer.log.mock.callCount(), 8);
 
     assert.strictEqual(
       printer.log.mock.calls[1].arguments[0],
       format.indent(`${format.bold('Identifier:')} \ttestSandboxName`)
     );
     assert.strictEqual(
-      printer.log.mock.calls[3].arguments[0],
+      printer.log.mock.calls[4].arguments[0],
       `${format.indent(
         format.dim('\nTo specify a different sandbox identifier, use ')
       )}${format.bold('--identifier')}`
     );
   });
 
+  void it('correctly displays the region at the startup', async () => {
+    ({ sandboxInstance } = await setupAndStartSandbox(
+      {
+        executor: sandboxExecutor,
+        ssmClient: ssmClientMock,
+        functionsLogStreamer:
+          functionsLogStreamerMock as unknown as LambdaFunctionLogStreamer,
+      },
+      undefined,
+      false
+    ));
+    assert.strictEqual(printer.log.mock.callCount(), 8);
+
+    assert.strictEqual(
+      printer.log.mock.calls[3].arguments[0],
+      format.indent(`${format.bold('Region:')} \ttest-region`)
+    );
+  });
+
   void it('makes initial deployment without type checking at start if no typescript file is present', async () => {
     ({ sandboxInstance, fileChangeEventCallback } = await setupAndStartSandbox(
       {

packages/sandbox/src/file_watching_sandbox.ts

@@ -442,13 +442,15 @@ export class FileWatchingSandbox extends EventEmitter implements Sandbox {
     );
     const stackName =
       BackendIdentifierConversions.toStackName(sandboxBackendId);
+    const region = await this.ssmClient.config.region();
     this.printer.log(
       format.indent(format.highlight(format.bold('\nAmplify Sandbox\n')))
     );
     this.printer.log(
       format.indent(`${format.bold('Identifier:')} \t${sandboxBackendId.name}`)
     );
     this.printer.log(format.indent(`${format.bold('Stack:')} \t${stackName}`));
+    this.printer.log(format.indent(`${format.bold('Region:')} \t${region}`));
     if (!sandboxIdentifier) {
       this.printer.log(
         `${format.indent(