Fix 3 IncludeCleaner findings:
* Used header "third_party/absl/base/thread_annotations.h" is not included directly
* Used header "third_party/absl/synchronization/mutex.h" is not included directly
* Used header "util/scaffolding/public/server_data.h" is not included directly

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#clrobot #MissingInclude

Tested:
    Local presubmit tests passed.
PiperOrigin-RevId: 974295949
Change-Id: I261cfaec2ec1016b65ede37e8a6de5bd0331a8d5

piper_cl.txt

diff --git a/piper_cl.txt b/piper_cl.txt
index 5cd05b6..69f6175 100644
--- a/piper_cl.txt
+++ b/piper_cl.txt
@@ -1 +1 @@
-974074293
+974295949

service_impl.cc

diff --git a/service_impl.cc b/service_impl.cc
index 7c08778..7ae66c1 100644
--- a/service_impl.cc
+++ b/service_impl.cc
@@ -11,6 +11,7 @@
 #include "absl/log/log.h"
 #include "absl/status/status.h"
 #include "absl/strings/str_cat.h"
+#include "absl/synchronization/mutex.h"
 #include "absl/time/time.h"
 
 namespace safepower_agent {

service_impl.h

diff --git a/service_impl.h b/service_impl.h
index 60de7f0..75e90e0 100644
--- a/service_impl.h
+++ b/service_impl.h
@@ -10,6 +10,7 @@
 #include "safepower_agent.pb.h"
 #include "state_updater.h"
 #include "absl/base/nullability.h"
+#include "absl/base/thread_annotations.h"
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
 #include "absl/synchronization/mutex.h"