MDEV-12459 Get temporary tables visible to the IS.tables for current connection

Additionally fixes the bugs uncovered in:
  - `MDEV-28332: Alter on temporary table causes ER_TABLE_EXISTS_ERROR note`
    Since there is no `warning` issued by shadowing of base table, this MDEV
    is irrelevant. Keeping for review purposes and for future development
    in case shadowing is going to be implemented
  - `MDEV-28334: SHOW TABLE STATUS shows all temporary tables ignoring database and conditions`
  - `MDEV-28453: SHOW commands are inconsistent for temporary tables`

Reviewed by: <monty@mariadb.org>,
             <vicentiu@mariadb.org>

mysql-test/suite/rpl/r/rpl_ddl.result

@@ -343,6 +343,7 @@ TEST-INFO: SLAVE:  The INSERT is committed (Succeeded)
 connection master;
 SHOW TABLES LIKE 't2';
 Tables_in_mysqltest1 (t2)
+t23
 connection slave;
 SHOW TABLES LIKE 't2';
 Tables_in_mysqltest1 (t2)

mysql-test/suite/rpl/r/rpl_row_create_table.result

@@ -243,6 +243,11 @@ Warnings:
 Warning	1196	Some non-transactional changed tables couldn't be rolled back
 SHOW TABLES;
 Tables_in_test
+tt7
+tt6
+tt5
+tt4
+tt3
 t1
 t2
 t3

mysql-test/suite/rpl/r/rpl_row_drop.result

@@ -6,6 +6,7 @@ CREATE TABLE t2 (a int);
 CREATE TEMPORARY TABLE t2 (a int, b int);
 SHOW TABLES;
 Tables_in_test
+t2
 t1
 t2
 connection slave;
@@ -28,6 +29,7 @@ connection master;
 CREATE TEMPORARY TABLE t2 (a int, b int);
 SHOW TABLES;
 Tables_in_test
+t2
 t1
 t2
 connection slave;