Capture core dump files from tests (#123169)

When running Elasticsearch in tests we occassionally have JDK crashes.
It's important to capture the state of the JVM at the time of the crash.
We currently capture the hs_err_pid file for the crash, but the
resulting core file exists in a directory that is no captured. This
commit adjusts the capture patterns to also get core files.

Author: rjernst

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/ElasticsearchBuildCompletePlugin.java

@@ -110,6 +110,8 @@ private List<File> resolveProjectLogs(File projectDir) {
         projectDirFiles.include("**/build/testrun/*/temp/**");
         projectDirFiles.include("**/build/**/hs_err_pid*.log");
         projectDirFiles.include("**/build/**/replay_pid*.log");
+        // core dump files are in the working directory of the installation, which is not project specific
+        projectDirFiles.include("distribution/**/build/install/*/core.*");
         projectDirFiles.exclude("**/build/testclusters/**/data/**");
         projectDirFiles.exclude("**/build/testclusters/**/distro/**");
         projectDirFiles.exclude("**/build/testclusters/**/repo/**");