config(amazonq): toggle NEP feature flag (aws#7668)

## 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: Will-ShaoHua

packages/amazonq/src/app/inline/completion.ts

@@ -401,7 +401,7 @@ ${itemLog}
             for (const item of items) {
                 if (item.isInlineEdit) {
                     // Check if Next Edit Prediction feature flag is enabled
-                    if (Experiments.instance.isExperimentEnabled('amazonqLSPNEP')) {
+                    if (Experiments.instance.get('amazonqLSPNEP', true)) {
                         await showEdits(item, editor, session, this.languageClient, this)
                         const t3 = performance.now()
                         logstr = logstr + `- duration since trigger to NEP suggestion is displayed: ${t3 - t0}ms`

packages/amazonq/src/lsp/client.ts

@@ -176,7 +176,7 @@ export async function startLanguageServer(
                     },
                     textDocument: {
                         inlineCompletionWithReferences: {
-                            inlineEditSupport: Experiments.instance.isExperimentEnabled('amazonqLSPNEP'),
+                            inlineEditSupport: Experiments.instance.get('amazonqLSPNEP', true),
                         },
                     },
                 },