chore: merge release candidate version rc-20250815 (#7916)

## Problem
This merges the released changes for rc-20250815 into main.
MCM-132479224

## 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: Lei Gao <[email protected]>
Co-authored-by: Na Yue <[email protected]>
Co-authored-by: Will Lo <[email protected]>
Co-authored-by: Aidan Ton <[email protected]>
Co-authored-by: atontb <[email protected]>

Author: 5 people

package-lock.json

@@ -0,0 +1,5 @@
+{
+	"date": "2025-08-15",
+	"version": "1.90.0",
+	"entries": []
+}

packages/amazonq/.changes/1.90.0.json

@@ -1,3 +1,7 @@
+## 1.90.0 2025-08-15
+
+- Miscellaneous non-user-facing changes
+
 ## 1.89.0 2025-08-13
 
 - Miscellaneous non-user-facing changes

packages/amazonq/CHANGELOG.md

@@ -2,7 +2,7 @@
     "name": "amazon-q-vscode",
     "displayName": "Amazon Q",
     "description": "The most capable generative AI–powered assistant for software development.",
-    "version": "1.90.0-SNAPSHOT",
+    "version": "1.91.0-SNAPSHOT",
     "extensionKind": [
         "workspace"
     ],