refactor(amazonq): Removing unwanted /dev and /doc code (#7760)

## Problem
- There is lot of duplicate and unwanted redundant code in
[aws-toolkit-vscode](https://github.com/aws/aws-toolkit-vscode)
repository.

## Solution

- This is the 2nd PR to remove unwanted code.
- Here is the 1st PR:
#7735
---

- 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: laileni-aws

.gitignore

@@ -31,7 +31,6 @@ src.gen/*
 **/src/shared/telemetry/clienttelemetry.d.ts
 **/src/codewhisperer/client/codewhispererclient.d.ts
 **/src/codewhisperer/client/codewhispereruserclient.d.ts
-**/src/amazonqFeatureDev/client/featuredevproxyclient.d.ts
 **/src/auth/sso/oidcclientpkce.d.ts
 
 # Generated by tests

packages/amazonq/test/unit/amazonqFeatureDev/session/chatSessionStorage.test.ts

@@ -241,10 +241,6 @@ void (async () => {
             serviceJsonPath: 'src/codewhisperer/client/user-service-2.json',
             serviceName: 'CodeWhispererUserClient',
         },
-        {
-            serviceJsonPath: 'src/amazonqFeatureDev/client/codewhispererruntime-2022-11-11.json',
-            serviceName: 'FeatureDevProxyClient',
-        },
     ]
     await generateServiceClients(serviceClientDefinitions)
 })()