[Gradle] Changed gradle so that tests run in parallel, preventing Out…

…OfMemory errors

PiperOrigin-RevId: 440899952
(cherry picked from commit e9b04a6)

build.gradle

@@ -155,6 +155,9 @@ def getArchivesBaseName(name) {
 subprojects {
     tasks.withType(Test) {
         maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: 1
+        forkEvery = 80
+        maxHeapSize = "2048m"
+        minHeapSize = "1024m"
     }
 }