Merge 10.6 into 10.10

The MDEV-29693 conflict resolution is from Monty, as well as is
a bug fix where ANALYZE TABLE wrongly built histograms for
single-column PRIMARY KEY.
Also includes a fix for safe_malloc error reporting.

Other things:
- Copied main.log_slow from 10.4 to avoid mtr issue

Disabled test:
- spider/bugfix.mdev_27239 because we started to get
  +Error	1429 Unable to connect to foreign data source: localhost
  -Error	1158 Got an error reading communication packets
- main.delayed
  - Bug#54332 Deadlock with two connections doing LOCK TABLE+INSERT DELAYED
    This part is disabled for now as it fails randomly with different
    warnings/errors (no corruption).

mysql-test/main/system_mysql_db_fix40123.result

@@ -242,15 +242,15 @@ slow_log	CREATE TABLE `slow_log` (
   `user_host` mediumtext NOT NULL,
   `query_time` time(6) NOT NULL,
   `lock_time` time(6) NOT NULL,
-  `rows_sent` int(11) NOT NULL,
-  `rows_examined` int(11) NOT NULL,
+  `rows_sent` bigint(20) unsigned NOT NULL,
+  `rows_examined` bigint(20) unsigned NOT NULL,
   `db` varchar(512) NOT NULL,
   `last_insert_id` int(11) NOT NULL,
   `insert_id` int(11) NOT NULL,
   `server_id` int(10) unsigned NOT NULL,
   `sql_text` mediumtext NOT NULL,
   `thread_id` bigint(21) unsigned NOT NULL,
-  `rows_affected` int(11) NOT NULL
+  `rows_affected` bigint(20) unsigned NOT NULL
 ) ENGINE=CSV DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_general_ci COMMENT='Slow log'
 show create table table_stats;
 Table	Create Table