manager: use new Logging.Cleared event

Modify the internal manager support for creating internal events
to be able to support the sdbusplus generated events.  Transition
from the local Logging.Error.LogsCleared to the global Logging.Cleared
event.  Clean up references to the old event.

Tested:
```
$ busctl --user call xyz.openbmc_project.Logging /xyz/openbmc_project/logging xyz.openbmc_project.Collection.DeleteAll DeleteAll
$ busctl --user introspect xyz.openbmc_project.Logging /xyz/openbmc_project/logging/entry/1 -l | cat
NAME                                        TYPE      SIGNATURE RESULT/VALUE                                                                                                                                             FLAGS
xyz.openbmc_project.Logging.Entry           interface -         -                                                                                                                                                        -
.GetEntry                                   method    -         h                                                                                                                                                        -
.AdditionalData                             property  as        5 "NUMBER_OF_LOGS=210" "_CODE_FILE=../log_manager.hpp" "_CODE_FUNC=virtual void phosphor::logging::Manager::deleteAll()" "_CODE_LINE=361" "_PID=3318436" emits-change writable
.EventId                                    property  s         ""                                                                                                                                                       emits-change writable
.Id                                         property  u         1                                                                                                                                                        emits-change writable
.Message                                    property  s         "xyz.openbmc_project.Logging.Cleared"                                                                                                                    emits-change writable
.Resolution                                 property  s         ""                                                                                                                                                       emits-change writable
.Resolved                                   property  b         false                                                                                                                                                    emits-change writable
.ServiceProviderNotify                      property  s         "xyz.openbmc_project.Logging.Entry.Notify.NotSupported"                                                                                                  emits-change writable
.Severity                                   property  s         "xyz.openbmc_project.Logging.Entry.Level.Informational"                                                                                                  emits-change writable
.Timestamp                                  property  t         1730408674348                                                                                                                                            emits-change writable
.UpdateTimestamp                            property  t         1730408674348                                                                                                                                            emits-change writable
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I470f33ae2f5bfae6bf6d6a80ac2c5f028e41da95
diff --git a/log_manager.cpp b/log_manager.cpp
index 1b0cf3f..de3509d 100644
--- a/log_manager.cpp
+++ b/log_manager.cpp
@@ -6,6 +6,7 @@
 #include "elog_meta.hpp"
 #include "elog_serialize.hpp"
 #include "extensions.hpp"
+#include "lib/lg2_commit.hpp"
 #include "paths.hpp"
 #include "util.hpp"
 
@@ -259,6 +260,13 @@
     return objPath;
 }
 
+auto Manager::createFromEvent(sdbusplus::exception::generated_event_base&&
+                                  event) -> sdbusplus::message::object_path
+{
+    auto [msg, level, data] = lg2::details::extractEvent(std::move(event));
+    return this->createEntry(msg, level, std::move(data));
+}
+
 bool Manager::isQuiesceOnErrorEnabled()
 {
     // When running under tests, the Logging.Settings service will not be