fix(cli): add workspacePath to extension variables (#8482)

Co-authored-by: Taneja Hriday <hridayt@google.com>

packages/cli/src/config/extensions/variableSchema.ts

@@ -15,6 +15,11 @@ export interface VariableSchema {
   [key: string]: VariableDefinition;
 }
 
+export interface LoadExtensionContext {
+  extensionDir: string;
+  workspaceDir: string;
+}
+
 const PATH_SEPARATOR_DEFINITION = {
   type: 'string',
   description: 'The path separator.',
@@ -25,6 +30,10 @@ export const VARIABLE_SCHEMA = {
     type: 'string',
     description: 'The path of the extension in the filesystem.',
   },
+  workspacePath: {
+    type: 'string',
+    description: 'The absolute path of the current workspace.',
+  },
   '/': PATH_SEPARATOR_DEFINITION,
   pathSeparator: PATH_SEPARATOR_DEFINITION,
 } as const;