telemetry: track interactive session state (#12856)

Co-authored-by: owenofbrien <86964623+owenofbrien@users.noreply.github.com>

packages/core/src/fallback/handler.test.ts

@@ -40,6 +40,7 @@ const createMockConfig = (overrides: Partial<Config> = {}): Config =>
     isInFallbackMode: vi.fn(() => false),
     setFallbackMode: vi.fn(),
     fallbackHandler: undefined,
+    isInteractive: vi.fn(() => false),
     ...overrides,
   }) as unknown as Config;