fix(amazonq): bring back experimental config (#7495)

## Problem


## 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.

Author: leigaol

packages/toolkit/package.json

@@ -258,6 +258,10 @@
                         "amazonqChatLSP": {
                             "type": "boolean",
                             "default": true
+                        },
+                        "amazonqLSPInlineChat": {
+                            "type": "boolean",
+                            "default": false
                         }
                     },
                     "additionalProperties": false