Remove unused #include's from backend .c files

as determined by include-what-you-use (IWYU)

While IWYU also suggests to *add* a bunch of #include's (which is its
main purpose), this patch does not do that.  In some cases, a more
specific #include replaces another less specific one.

Some manual adjustments of the automatic result:

- IWYU currently doesn't know about includes that provide global
  variable declarations (like -Wmissing-variable-declarations), so
  those includes are being kept manually.

- All includes for port(ability) headers are being kept for now, to
  play it safe.

- No changes of catalog/pg_foo.h to catalog/pg_foo_d.h, to keep the
  patch from exploding in size.

Note that this patch touches just *.c files, so nothing declared in
header files changes in hidden ways.

As a small example, in src/backend/access/transam/rmgr.c, some IWYU
pragma annotations are added to handle a special case there.

Discussion: https://www.postgresql.org/message-id/flat/af837490-6b2f-46df-ba05-37ea6a6653fc%40eisentraut.org

src/backend/replication/logical/worker.c

@@ -147,65 +147,40 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-#include "access/genam.h"
 #include "access/table.h"
 #include "access/tableam.h"
 #include "access/twophase.h"
 #include "access/xact.h"
-#include "access/xlog_internal.h"
-#include "catalog/catalog.h"
 #include "catalog/indexing.h"
-#include "catalog/namespace.h"
-#include "catalog/partition.h"
 #include "catalog/pg_inherits.h"
 #include "catalog/pg_subscription.h"
 #include "catalog/pg_subscription_rel.h"
-#include "catalog/pg_tablespace.h"
 #include "commands/tablecmds.h"
-#include "commands/tablespace.h"
 #include "commands/trigger.h"
 #include "executor/executor.h"
 #include "executor/execPartition.h"
-#include "executor/nodeModifyTable.h"
-#include "funcapi.h"
 #include "libpq/pqformat.h"
-#include "libpq/pqsignal.h"
-#include "mb/pg_wchar.h"
 #include "miscadmin.h"
-#include "nodes/makefuncs.h"
 #include "optimizer/optimizer.h"
 #include "parser/parse_relation.h"
 #include "pgstat.h"
 #include "postmaster/bgworker.h"
 #include "postmaster/interrupt.h"
-#include "postmaster/postmaster.h"
 #include "postmaster/walwriter.h"
-#include "replication/decode.h"
-#include "replication/logical.h"
 #include "replication/logicallauncher.h"
 #include "replication/logicalproto.h"
 #include "replication/logicalrelation.h"
 #include "replication/logicalworker.h"
 #include "replication/origin.h"
-#include "replication/reorderbuffer.h"
-#include "replication/snapbuild.h"
 #include "replication/walreceiver.h"
 #include "replication/worker_internal.h"
 #include "rewrite/rewriteHandler.h"
 #include "storage/buffile.h"
-#include "storage/bufmgr.h"
-#include "storage/fd.h"
 #include "storage/ipc.h"
 #include "storage/lmgr.h"
-#include "storage/proc.h"
-#include "storage/procarray.h"
 #include "tcop/tcopprot.h"
 #include "utils/acl.h"
-#include "utils/builtins.h"
-#include "utils/catcache.h"
 #include "utils/dynahash.h"
-#include "utils/datum.h"
-#include "utils/fmgroids.h"
 #include "utils/guc.h"
 #include "utils/inval.h"
 #include "utils/lsyscache.h"
@@ -213,8 +188,8 @@
 #include "utils/pg_lsn.h"
 #include "utils/rel.h"
 #include "utils/rls.h"
+#include "utils/snapmgr.h"
 #include "utils/syscache.h"
-#include "utils/timeout.h"
 #include "utils/usercontext.h"
 
 #define NAPTIME_PER_CYCLE 1000	/* max sleep time between cycles (1s) */