Remove unused #include's from backend .c files

as determined by IWYU

These are mostly issues that are new since commit dbbca2cf29.

Discussion: https://www.postgresql.org/message-id/flat/0df1d5b1-8ca8-4f84-93be-121081bde049%40eisentraut.org

src/backend/utils/activity/backend_progress.c

@@ -12,7 +12,6 @@
 
 #include "access/parallel.h"
 #include "libpq/pqformat.h"
-#include "port/atomics.h"		/* for memory barriers */
 #include "utils/backend_progress.h"
 #include "utils/backend_status.h"
 

src/backend/utils/activity/backend_status.c

@@ -16,11 +16,9 @@
 #include "miscadmin.h"
 #include "pg_trace.h"
 #include "pgstat.h"
-#include "port/atomics.h"		/* for memory barriers */
 #include "storage/ipc.h"
 #include "storage/proc.h"		/* for MyProc */
 #include "storage/procarray.h"
-#include "storage/sinvaladt.h"
 #include "utils/ascii.h"
 #include "utils/guc.h"			/* for application_name */
 #include "utils/memutils.h"

src/backend/utils/activity/pgstat.c

@@ -105,7 +105,6 @@
 #include "access/xlog.h"
 #include "lib/dshash.h"
 #include "pgstat.h"
-#include "port/atomics.h"
 #include "storage/fd.h"
 #include "storage/ipc.h"
 #include "storage/lwlock.h"

src/backend/utils/activity/pgstat_relation.c

@@ -20,7 +20,6 @@
 #include "access/twophase_rmgr.h"
 #include "access/xact.h"
 #include "catalog/catalog.h"
-#include "postmaster/autovacuum.h"
 #include "utils/memutils.h"
 #include "utils/pgstat_internal.h"
 #include "utils/rel.h"

src/backend/utils/activity/wait_event.c

@@ -22,7 +22,6 @@
  */
 #include "postgres.h"
 
-#include "port/pg_bitutils.h"
 #include "storage/lmgr.h"		/* for GetLockNameFromTagType */
 #include "storage/lwlock.h"		/* for GetLWLockIdentifier */
 #include "storage/spin.h"