Un-skip auto-increment overflow tests from PR #3100

Removed Skip: true from tests that verify auto-increment behavior at maximum values.
Our fix now allows these tests to pass:
- Insert max values (127 for TINYINT, 32767 for SMALLINT, etc.)
- Verify SHOW CREATE TABLE shows correct AUTO_INCREMENT values
- Removed redundant auto_increment_overflow_test.go file

Tests now properly validate that AUTO_INCREMENT values don't exceed type limits
and display correctly in SHOW CREATE TABLE output.

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

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

Author: elianddb

enginetest/queries/auto_increment_overflow_test.go

@@ -10486,7 +10486,6 @@ where
 				ExpectedErr: sql.ErrValueOutOfRange,
 			},
 			{
-				Skip:  true,
 				Query: "insert into tinyint_tbl values (127)",
 				Expected: []sql.Row{
 					{types.OkResult{
@@ -10496,7 +10495,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table tinyint_tbl;",
 				Expected: []sql.Row{
 					{"tinyint_tbl", "CREATE TABLE `tinyint_tbl` (\n" +
@@ -10512,7 +10510,6 @@ where
 				ExpectedErr: sql.ErrValueOutOfRange,
 			},
 			{
-				Skip:  true,
 				Query: "insert into smallint_tbl values (32767);",
 				Expected: []sql.Row{
 					{types.OkResult{
@@ -10522,13 +10519,12 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table smallint_tbl;",
 				Expected: []sql.Row{
 					{"smallint_tbl", "CREATE TABLE `smallint_tbl` (\n" +
 						"  `i` smallint NOT NULL AUTO_INCREMENT,\n" +
 						"  PRIMARY KEY (`i`)\n" +
-						") ENGINE=InnoDB AUTO_INCREMENT=36727 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin"},
+						") ENGINE=InnoDB AUTO_INCREMENT=32767 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin"},
 				},
 			},
 
@@ -10564,7 +10560,6 @@ where
 				ExpectedErr: sql.ErrValueOutOfRange,
 			},
 			{
-				Skip:  true,
 				Query: "insert into int_tbl values (2147483647)",
 				Expected: []sql.Row{
 					{types.OkResult{
@@ -10574,7 +10569,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table int_tbl;",
 				Expected: []sql.Row{
 					{"int_tbl", "CREATE TABLE `int_tbl` (\n" +
@@ -10590,7 +10584,6 @@ where
 				ExpectedErr: sql.ErrValueOutOfRange,
 			},
 			{
-				Skip:  true,
 				Query: "insert into bigint_tbl values (9223372036854775807);",
 				Expected: []sql.Row{
 					{types.OkResult{
@@ -10600,7 +10593,6 @@ where
 				},
 			},
 			{
-				Skip:  true,
 				Query: "show create table bigint_tbl;",
 				Expected: []sql.Row{
 					{"bigint_tbl", "CREATE TABLE `bigint_tbl` (\n" +