fix(codewhisperer): Cloud9 alt+c keybinding fails

Problem:
- `setContext` is not supported in Cloud9, so `CODEWHISPERER_ENABLED` is always
  false in package.json.
- Parentheses can't be used for logical grouping in the "when" clause (confirmed
  on the latest Cloud9, which uses vscode 1.68 extension host).

Solution:
- Check for `isCloud9` and other flags a workaround.
- Use redundant logic to workaround the lack of parentheses support.

Author: Will-ShaoHua

package.json

@@ -3856,13 +3856,13 @@
                 "command": "aws.codeWhisperer",
                 "key": "alt+c",
                 "mac": "alt+c",
-                "when": "editorTextFocus && CODEWHISPERER_ENABLED"
+                "when": "editorTextFocus && CODEWHISPERER_ENABLED || isCloud9 && editorTextFocus"
             },
             {
                 "command": "aws.codeWhisperer.rejectCodeSuggestion",
                 "key": "escape",
                 "mac": "escape",
-                "when": "inlineSuggestionVisible && !editorReadonly && CODEWHISPERER_ENABLED"
+                "when": "inlineSuggestionVisible && !editorReadonly && CODEWHISPERER_ENABLED || isCloud9 && suggestWidgetVisible && !editorReadonly"
             },
             {
                 "key": "right",

src/codewhisperer/commands/invokeRecommendation.ts

@@ -57,6 +57,12 @@ export async function invokeRecommendation(
     }
 
     if (isCloud9('any')) {
+        // C9 manual trigger key alt/option + C is ALWAYS enabled because the VSC version C9 is on doesn't support setContextKey which is used for CODEWHISPERER_ENABLED
+        // therefore we need a connection check if there is ANY connection(regardless of the connection's state) connected to CodeWhisperer on C9
+        if (!AuthUtil.instance.isConnected()) {
+            return
+        }
+
         if (RecommendationHandler.instance.isGenerateRecommendationInProgress) {
             return
         }