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/common/app-paths/app-paths.test.ts

@@ -38,7 +38,7 @@ describe("app-paths", () => {
       userData: "/some-irrelevant-user-data",
     };
 
-    builder.beforeApplicationStart((mainDi) => {
+    builder.beforeApplicationStart(({ mainDi }) => {
       mainDi.override(
         getElectronAppPathInjectable,
         () =>
@@ -120,7 +120,7 @@ describe("app-paths", () => {
     let windowDi: DiContainer;
 
     beforeEach(async () => {
-      builder.beforeApplicationStart((mainDi) => {
+      builder.beforeApplicationStart(({ mainDi }) => {
         mainDi.override(
           directoryForIntegrationTestingInjectable,
           () => "/some-integration-testing-app-data",