Add CIS policy "Ensure XD/NX support is enabled" back for SCA

[vikman90]

Issue #6997 stated that SCA was consuming more memory than acceptable when running command that produced a very large output. So we temporarily removed the policy involved "Ensure XD/NX support is enabled" (wazuh/wazuh-ruleset#822).

After issue #3340 (PR #7307) is closed, shell commands will be allowed in SCA via sh -c "...". Then we will add that policy back, using shell commands.

For instance:

- 'sh -c "c:journalctl | grep \"protection: active\"" -> r:^kernel:\s+NX \(Execute Disable\) protection: active'