logging: Also add the command prefix to detail and hint messages

This makes the output line up better and allows filtering messages by
command.

Discussion: https://www.postgresql.org/message-id/ba6d4fac-9e33-91f9-94fb-1e4c144a48b9@enterprisedb.com

src/bin/pg_dump/t/003_pg_dump_with_server.pl

@@ -30,7 +30,7 @@ my ($cmd, $stdout, $stderr, $result);
 
 command_fails_like(
 	[ "pg_dump", '-p', $port, '--include-foreign-data=s0', 'postgres' ],
-	qr/foreign-data wrapper \"dummy\" has no handler\r?\ndetail: Query was: .*t0/,
+	qr/foreign-data wrapper \"dummy\" has no handler\r?\npg_dump: detail: Query was: .*t0/,
 	"correctly fails to dump a foreign table from a dummy FDW");
 
 command_ok(

src/common/logging.c

@@ -246,8 +246,7 @@ pg_log_generic_v(enum pg_log_level level, enum pg_log_part part,
 
 	fmt = _(fmt);
 
-	if (part == PG_LOG_PRIMARY &&
-		(!(log_flags & PG_LOG_FLAG_TERSE) || filename))
+	if (!(log_flags & PG_LOG_FLAG_TERSE) || filename)
 	{
 		if (sgr_locus)
 			fprintf(stderr, ANSI_ESCAPE_FMT, sgr_locus);