Revert "cmk-update-agent: migrate ruleset to form_specs v1 #1"

This reverts commit e19e203.

Reason for revert: test-integration-single-f12less

Change-Id: I208aa69abc1426529f885e6d1f1c1dca6487342a

Author: nigelgbanks

tests/unit/cmk/gui/watolib/test_rulespecs.py

@@ -283,6 +283,7 @@ def test_rulespec_get_all_groups() -> None:
 
     if cmk_version.edition(paths.omd_root) is not cmk_version.Edition.COMMUNITY:
         expected_rulespec_groups += [
+            "agents/automatic_updates",
             "agents/linux_agent",
             "agents/windows_agent",
             "agents/windows_modules",