Add xpack core and security to INTEG TEST (#77632)

This change makes it so x-pack-core and x-pack-security are bundled
in the INTEG TEST distribution that we use for testClusters in our
tests. There are two reasons for this:

- In https://github.com/elastic/elasticsearch/pull/77231 where we
are looking into enabling and auto-configuring security by default
for all nodes, we need to call out to ConfigInitialNode to
determine whether we should do the auto-configuration or not.
- Since we are enabling security by default, we should be looking
into enabling security for all for our tests moving forward, or
at least make a conscious decision about which ones run without
security. This change is a step towards that direction.

distribution/packages/build.gradle

@@ -130,7 +130,7 @@ def commonPackageConfig(String type, String architecture) {
         fileMode 0644
       }
       into('lib') {
-        with libFiles(false)
+        with libFiles
       }
       into('modules') {
         with modulesFiles('linux-' + ((architecture == 'x64') ? 'x86_64' : architecture))