Change typing for after/before window/application start (#7342)

- Now the callback is provided with an object containing either
  `mainDi` or `windowDi` fields. This should help with confusion
  over which environment the `di` is for

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/core/src/features/status-bar/status-bar-items-originating-from-extensions.test.tsx

@@ -16,7 +16,7 @@ describe("status-bar-items-originating-from-extensions", () => {
   beforeEach(() => {
     applicationBuilder = getApplicationBuilder();
 
-    applicationBuilder.beforeWindowStart((windowDi) => {
+    applicationBuilder.beforeWindowStart(({ windowDi }) => {
       windowDi.unoverride(getRandomIdInjectable);
       windowDi.permitSideEffects(getRandomIdInjectable);
     });