fix(cloud9): CodeWhisperer not available in C++ files #3879

Problem:
In Cloud9 the languageId for any C/C++ document 'c_cpp'.

Solution:
Accept 'c_cpp' as a languageId supported by CodeWhisperer.

Author: justinmk3

src/codewhisperer/models/constants.ts

@@ -93,6 +93,7 @@ export const supportedLanguages = [
     'csharp',
     'c',
     'cpp',
+    'c_cpp', // Cloud9 reports C++ files with this language-id.
     'go',
     'kotlin',
     'php',

src/codewhisperer/util/runtimeLanguageContext.ts

@@ -36,6 +36,7 @@ export class RuntimeLanguageContext {
             typescriptreact: 'tsx',
             csharp: 'csharp',
             c: 'c',
+            c_cpp: 'cpp',
             cpp: 'cpp',
             go: 'go',
             kotlin: 'kotlin',
@@ -55,6 +56,7 @@ export class RuntimeLanguageContext {
             typescriptreact: 'tsx',
             csharp: 'cs',
             c: 'c',
+            c_cpp: 'cpp',
             cpp: 'cpp',
             go: 'go',
             kotlin: 'kt',