Delete insert.json

test: no use

tests/system-test/insert.json

-{
-	"filetype": "insert",
-	"cfgdir": "/etc/taos",
-	"host": "127.0.0.1",
-	"port": 6030,
-	"user": "root",
-	"password": "taosdata",
-	"thread_count": 16,
-	"create_table_thread_count": 1,
-	"result_file": "./insert_res.txt",
-	"confirm_parameter_prompt": "no",
-	"insert_interval": 0,
-	"interlace_rows": 0,
-	"num_of_records_per_req": 10000,
-	"prepared_rand": 10000,
-	"chinese": "no",
-	"databases": [
-		{
-			"dbinfo": {
-				"name": "db",
-				"drop": "yes",
-				"vgroups":4,
-				"replica": 1,
-				"precision": "ms"
-				},
-			"super_tables": [
-				{
-					"name": "stb",
-					"child_table_exists": "no",
-					"childtable_count": 1000,
-					"childtable_prefix": "stb_",
-					"escape_character": "no",
-					"auto_create_table": "no",
-					"batch_create_tbl_num": 10,
-					"data_source": "rand",
-					"insert_mode": "taosc",
-					"non_stop_mode": "no",
-					"line_protocol": "line",
-					"insert_rows": 100000,
-					"interlace_rows": 0,
-					"insert_interval": 0,
-					"disorder_ratio": 0,
-					"timestamp_step": 1,
-					"start_timestamp": "2020-10-01 00:00:00.000",
-					"use_sample_ts": "no",
-					"tags_file": "",
-					"columns": [
-						{
-							"type": "FLOAT",
-							"name": "current",
-							"count": 4,
-							"max": 12,
-							"min": 8
-						},
-						{ "type": "INT", "name": "voltage", "max": 225, "min": 215 },
-						{ "type": "FLOAT", "name": "phase", "max": 1, "min": 0 }
-					],
-					"tags": [
-						{
-							"type": "TINYINT",
-							"name": "groupid",
-							"max": 10,
-							"min": 1
-						},
-						{
-							"name": "location",
-							"type": "BINARY",
-							"len": 16,
-							"values": ["beijing", "shanghai"]
-						}
-					]
-				}
-			]
-		}
-	]
-}