docs: add "Q Developer" marketplace tag (#6810)

The Q product name should find amazon-q-vscode.

---

- 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: hayemaxi

packages/amazonq/package.json

@@ -32,7 +32,8 @@
         "Codewhisperer",
         "AI",
         "Assistant",
-        "Chatbot"
+        "Chatbot",
+        "Q Developer"
     ],
     "preview": false,
     "qna": "https://github.com/aws/aws-toolkit-vscode/issues",