refactor(amazonq): delegate language server to handle concurrent inline requests (#7952)

## 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

@@ -300,12 +300,6 @@ export class AmazonQInlineCompletionItemProvider implements InlineCompletionItem
             options: JSON.stringify(getAllRecommendationsOptions),
         })
 
-        // prevent concurrent API calls and write to shared state variables
-        if (vsCodeState.isRecommendationsActive) {
-            getLogger().info('Recommendations already active, returning empty')
-            return []
-        }
-
         if (vsCodeState.isCodeWhispererEditing) {
             getLogger().info('Q is editing, returning empty')
             return []