exclude acceptance tests from coverage metrics (#2942)

Signed-off-by: Justin Florentine <justin+github@florentine.us>

build.gradle

@@ -793,7 +793,9 @@ task checkSpdxHeader(type: CheckSpdxHeader) {
 task jacocoRootReport(type: org.gradle.testing.jacoco.tasks.JacocoReport) {
   additionalSourceDirs.from files(subprojects.sourceSets.main.allSource.srcDirs)
   sourceDirectories.from files(subprojects.sourceSets.main.allSource.srcDirs)
-  classDirectories.from files(subprojects.sourceSets.main.output)
+  classDirectories.from files(subprojects.sourceSets.main.output).asFileTree.matching {
+    exclude 'org/hyperledger/besu/tests/acceptance/**'
+  }
   executionData.from fileTree(dir: '.', includes: ['**/jacoco/*.exec'])
   reports {
     xml.required = true