ExecNodeGraphInternalPlan#writeToFile should support TRUNCATE_EXISTING for overwriting

Flink SQL> create table debug_sink (f0 int, f1 string) with ('connector' = 'blackhole');
[INFO] Execute statement succeed.

Flink SQL> create table dummy_source (f0 int, f1 int, f2 string, f3 string) with ('connector' = 'datagen');
[INFO] Execute statement succeed.

Flink SQL> compile plan '/foo/bar/debug.json' for insert into debug_sink select if(f0 > f1, f0, f1) as f0, concat(f2, f3) as f1 from dummy_source;
[INFO] Execute statement succeed.

Flink SQL> set 'table.plan.force-recompile' = 'true';
[INFO] Execute statement succeed.

Flink SQL> compile plan '/foo/bar/debug.json' for insert into debug_sink select * from (values (2, 'bye')) T (id, message);
[INFO] Execute statement succeed.

     1	{
     2	  "flinkVersion" : "1.17",
     3	  "nodes" : [ {
     4	    "id" : 15,
     5	    "type" : "stream-exec-values_1",
     6	    "tuples" : [ [ {
     7	      "kind" : "LITERAL",
     8	      "value" : "2",
     9	      "type" : "INT NOT NULL"
    10	    }, {
    11	      "kind" : "LITERAL",
    12	      "value" : "bye",
    13	      "type" : "CHAR(3) NOT NULL"
    14	    } ] ],
    15	    "outputType" : "ROW<`id` INT NOT NULL, `message` CHAR(3) NOT NULL>",
    16	    "description" : "Values(tuples=[[{ 2, _UTF-16LE'bye' }]])",
    17	    "inputProperties" : [ ]
    18	  }, {
    19	    "id" : 16,
    20	    "type" : "stream-exec-sink_1",
    21	    "configuration" : {
    22	      "table.exec.sink.keyed-shuffle" : "AUTO",
    23	      "table.exec.sink.not-null-enforcer" : "ERROR",
    24	      "table.exec.sink.type-length-enforcer" : "IGNORE",
    25	      "table.exec.sink.upsert-materialize" : "AUTO"
    26	    },
    27	    "dynamicTableSink" : {
    28	      "table" : {
    29	        "identifier" : "`default_catalog`.`default_database`.`debug_sink`",
    30	        "resolvedTable" : {
    31	          "schema" : {
    32	            "columns" : [ {
    33	              "name" : "f0",
    34	              "dataType" : "INT"
    35	            }, {
    36	              "name" : "f1",
    37	              "dataType" : "VARCHAR(2147483647)"
    38	            } ],
    39	            "watermarkSpecs" : [ ]
    40	          },
    41	          "partitionKeys" : [ ],
    42	          "options" : {
    43	            "connector" : "blackhole"
    44	          }
    45	        }
    46	      }
    47	    },
    48	    "inputChangelogMode" : [ "INSERT" ],
    49	    "inputProperties" : [ {
    50	      "requiredDistribution" : {
    51	        "type" : "UNKNOWN"
    52	      },
    53	      "damBehavior" : "PIPELINED",
    54	      "priority" : 0
    55	    } ],
    56	    "outputType" : "ROW<`id` INT NOT NULL, `message` CHAR(3) NOT NULL>",
    57	    "description" : "Sink(table=[default_catalog.default_database.debug_sink], fields=[id, message])"
    58	  } ],
    59	  "edges" : [ {
    60	    "source" : 15,
    61	    "target" : 16,
    62	    "shuffle" : {
    63	      "type" : "FORWARD"
    64	    },
    65	    "shuffleMode" : "PIPELINED"
    66	  } ]
    67	} "$CONCAT$1",
    68	      "operands" : [ {
    69	        "kind" : "INPUT_REF",
    70	        "inputIndex" : 2,
    71	        "type" : "VARCHAR(2147483647)"
    72	      }, {
    73	        "kind" : "INPUT_REF",
    74	        "inputIndex" : 3,
    75	        "type" : "VARCHAR(2147483647)"
    76	      } ],
    77	      "type" : "VARCHAR(2147483647)"
    78	    } ],
    79	    "condition" : null,
    80	    "inputProperties" : [ {
    81	      "requiredDistribution" : {
    82	        "type" : "UNKNOWN"
    83	      },
    84	      "damBehavior" : "PIPELINED",
    85	      "priority" : 0
    86	    } ],
    87	    "outputType" : "ROW<`f0` INT, `f1` VARCHAR(2147483647)>",
    88	    "description" : "Calc(select=[IF((f0 > f1), f0, f1) AS f0, CONCAT(f2, f3) AS f1])"
    89	  }, {
    90	    "id" : 14,
    91	    "type" : "stream-exec-sink_1",
    92	    "configuration" : {
    93	      "table.exec.sink.keyed-shuffle" : "AUTO",
    94	      "table.exec.sink.not-null-enforcer" : "ERROR",
    95	      "table.exec.sink.type-length-enforcer" : "IGNORE",
    96	      "table.exec.sink.upsert-materialize" : "AUTO"
    97	    },
    98	    "dynamicTableSink" : {
    99	      "table" : {
   100	        "identifier" : "`default_catalog`.`default_database`.`debug_sink`",
   101	        "resolvedTable" : {
   102	          "schema" : {
   103	            "columns" : [ {
   104	              "name" : "f0",
   105	              "dataType" : "INT"
   106	            }, {
   107	              "name" : "f1",
   108	              "dataType" : "VARCHAR(2147483647)"
   109	            } ],
   110	            "watermarkSpecs" : [ ]
   111	          },
   112	          "partitionKeys" : [ ],
   113	          "options" : {
   114	            "connector" : "blackhole"
   115	          }
   116	        }
   117	      }
   118	    },
   119	    "inputChangelogMode" : [ "INSERT" ],
   120	    "inputProperties" : [ {
   121	      "requiredDistribution" : {
   122	        "type" : "UNKNOWN"
   123	      },
   124	      "damBehavior" : "PIPELINED",
   125	      "priority" : 0
   126	    } ],
   127	    "outputType" : "ROW<`f0` INT, `f1` VARCHAR(2147483647)>",
   128	    "description" : "Sink(table=[default_catalog.default_database.debug_sink], fields=[f0, f1])"
   129	  } ],
   130	  "edges" : [ {
   131	    "source" : 12,
   132	    "target" : 13,
   133	    "shuffle" : {
   134	      "type" : "FORWARD"
   135	    },
   136	    "shuffleMode" : "PIPELINED"
   137	  }, {
   138	    "source" : 13,
   139	    "target" : 14,
   140	    "shuffle" : {
   141	      "type" : "FORWARD"
   142	    },
   143	    "shuffleMode" : "PIPELINED"
   144	  } ]
   145	}