Update script to use snapshot builds in integration tests (#1691)

Now the script works in the presence of [isolated
projects](https://docs.gradle.org/current/userguide/isolated_projects.html),
which were recently enabled by JUnit.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
* Improved internal build configuration for more consistent dependency
resolution.
* Renamed an internal generic-call inference result type without
changing public behavior.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: msridhar

.github/workflows/use-snapshot.gradle.kts

@@ -1,24 +1,20 @@
 // An init script to override a build configuration to use a snapshot version of NullAway
-allprojects {
+gradle.lifecycle.beforeProject {
   repositories {
     mavenCentral()
     mavenLocal()
     gradlePluginPortal()
   }
-}
 
-gradle.projectsLoaded {
-  rootProject.allprojects {
-    configurations.all {
-      resolutionStrategy {
-        eachDependency {
-          if (requested.group == "com.uber.nullaway") {
-            useVersion("+")
-          }
+  configurations.configureEach {
+    resolutionStrategy {
+      eachDependency {
+        if (requested.group == "com.uber.nullaway") {
+          useVersion("+")
         }
-        cacheChangingModulesFor(0, "seconds")
-        cacheDynamicVersionsFor(0, "seconds")
       }
+      cacheChangingModulesFor(0, "seconds")
+      cacheDynamicVersionsFor(0, "seconds")
     }
   }
 }