fix: similar to policy-engine, throw error in case of requiring tool execution confirmation for non-interactive mode (#14702)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/a2a-server/src/utils/testing_utils.ts

@@ -32,6 +32,7 @@ export function createMockConfig(
     }),
     getApprovalMode: vi.fn().mockReturnValue(ApprovalMode.DEFAULT),
     getIdeMode: vi.fn().mockReturnValue(false),
+    isInteractive: () => true,
     getAllowedTools: vi.fn().mockReturnValue([]),
     getWorkspaceContext: vi.fn().mockReturnValue({
       isPathWithinWorkspace: () => true,