build(amazonq): merge release candidate version rc-20250910 (aws#8020)

## Problem
This merges the released changes for rc-20250910 into main.
MCM-134160906

## Solution


---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

---------

Co-authored-by: aws-toolkit-automation <>

Author: tsmithsz

package-lock.json

@@ -0,0 +1,18 @@
+{
+	"date": "2025-09-10",
+	"version": "3.74.0",
+	"entries": [
+		{
+			"type": "Feature",
+			"description": "Feature to support the access of SageMakerUnified Studio resources from the local VSCode IDE"
+		},
+		{
+			"type": "Feature",
+			"description": "AWS Toolkit now correctly uses the endpoint URL specified in the AWS config file for the selected profile"
+		},
+		{
+			"type": "Feature",
+			"description": "Lambda AppBuilder: Now you can install LocalStack VS Code extension from the AppBuilder walkthrough"
+		}
+	]
+}

packages/toolkit/.changes/3.74.0.json

@@ -1,3 +1,9 @@
+## 3.74.0 2025-09-10
+
+- **Feature** Feature to support the access of SageMakerUnified Studio resources from the local VSCode IDE
+- **Feature** AWS Toolkit now correctly uses the endpoint URL specified in the AWS config file for the selected profile
+- **Feature** Lambda AppBuilder: Now you can install LocalStack VS Code extension from the AppBuilder walkthrough
+
 ## 3.73.0 2025-09-05
 
 - Miscellaneous non-user-facing changes

packages/toolkit/.changes/next-release/Feature-11b05698-7406-4ccd-afd2-a22d3adbfa67.json

@@ -2,7 +2,7 @@
     "name": "aws-toolkit-vscode",
     "displayName": "AWS Toolkit",
     "description": "Including CodeCatalyst, Infrastructure Composer, and support for Lambda, S3, CloudWatch Logs, CloudFormation, and many other services.",
-    "version": "3.74.0-SNAPSHOT",
+    "version": "3.75.0-SNAPSHOT",
     "extensionKind": [
         "workspace"
     ],