Unskip unsigned integer auto-increment SHOW CREATE TABLE tests

These tests verify that SHOW CREATE TABLE correctly displays AUTO_INCREMENT
values at integer type maximums for unsigned types:
- TINYINT UNSIGNED: AUTO_INCREMENT=255
- SMALLINT UNSIGNED: AUTO_INCREMENT=65535
- MEDIUMINT UNSIGNED: AUTO_INCREMENT=16777215
- INT UNSIGNED: AUTO_INCREMENT=4294967295
- BIGINT UNSIGNED: AUTO_INCREMENT=18446744073709551615

Related to dolthub/dolt#9530 auto-increment overflow protection fix.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: elianddb

enginetest/queries/script_queries.go

@@ -10794,7 +10794,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table tinyint_tbl;",
 				Expected: []sql.Row{
 					{"tinyint_tbl", "CREATE TABLE `tinyint_tbl` (\n" +
@@ -10820,7 +10819,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table smallint_tbl;",
 				Expected: []sql.Row{
 					{"smallint_tbl", "CREATE TABLE `smallint_tbl` (\n" +
@@ -10846,7 +10844,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table mediumint_tbl;",
 				Expected: []sql.Row{
 					{"mediumint_tbl", "CREATE TABLE `mediumint_tbl` (\n" +
@@ -10872,7 +10869,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table int_tbl;",
 				Expected: []sql.Row{
 					{"int_tbl", "CREATE TABLE `int_tbl` (\n" +
@@ -10898,7 +10894,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table bigint_tbl;",
 				Expected: []sql.Row{
 					{"bigint_tbl", "CREATE TABLE `bigint_tbl` (\n" +