Fix to have stable sorting for end cap artifacts (#6589)

* Fix to have stable sorting for end cap artifacts

* Update output

rust/kcl-lib/tests/pattern_into_union/artifact_graph_flowchart.snap.md

@@ -116,67 +116,67 @@ flowchart LR
   6 --- 23
   6 ---- 28
   7 --- 43
-  7 x--> 50
+  7 x--> 49
   7 --- 64
   7 --- 75
   8 --- 40
-  8 x--> 50
+  8 x--> 49
   8 --- 60
   8 --- 78
   9 --- 39
-  9 x--> 50
+  9 x--> 49
   9 --- 63
   9 --- 76
   10 --- 41
-  10 x--> 50
+  10 x--> 49
   10 --- 59
   10 --- 80
   11 --- 38
-  11 x--> 50
+  11 x--> 49
   11 --- 61
   11 --- 81
   12 --- 37
-  12 x--> 50
+  12 x--> 49
   12 --- 66
   12 --- 82
   13 --- 42
-  13 x--> 50
+  13 x--> 49
   13 --- 65
   13 --- 77
   14 --- 44
-  14 x--> 50
+  14 x--> 49
   14 --- 62
   14 --- 79
   15 --- 35
-  15 x--> 49
+  15 x--> 48
   15 --- 55
   15 --- 73
   16 --- 34
-  16 x--> 49
+  16 x--> 48
   16 --- 58
   16 --- 72
   17 --- 36
-  17 x--> 49
+  17 x--> 48
   17 --- 56
   17 --- 71
   18 --- 33
-  18 x--> 49
+  18 x--> 48
   18 --- 57
   18 --- 74
   19 --- 31
-  19 x--> 48
+  19 x--> 50
   19 --- 53
   19 --- 69
   20 --- 32
-  20 x--> 48
+  20 x--> 50
   20 --- 52
   20 --- 68
   21 --- 30
-  21 x--> 48
+  21 x--> 50
   21 --- 51
   21 --- 70
   22 --- 29
-  22 x--> 48
+  22 x--> 50
   22 --- 54
   22 --- 67
   26 --- 37
@@ -187,8 +187,8 @@ flowchart LR
   26 --- 42
   26 --- 43
   26 --- 44
-  26 --- 47
-  26 --- 50
+  26 --- 46
+  26 --- 49
   26 --- 59
   26 --- 60
   26 --- 61
@@ -209,8 +209,8 @@ flowchart LR
   27 --- 34
   27 --- 35
   27 --- 36
-  27 --- 46
-  27 --- 49
+  27 --- 45
+  27 --- 48
   27 --- 55
   27 --- 56
   27 --- 57
@@ -223,8 +223,8 @@ flowchart LR
   28 --- 30
   28 --- 31
   28 --- 32
-  28 --- 45
-  28 --- 48
+  28 --- 47
+  28 --- 50
   28 --- 51
   28 --- 52
   28 --- 53
@@ -277,22 +277,22 @@ flowchart LR
   62 <--x 44
   77 <--x 44
   79 <--x 44
-  51 <--x 45
-  52 <--x 45
-  53 <--x 45
-  54 <--x 45
-  55 <--x 46
-  56 <--x 46
-  57 <--x 46
-  58 <--x 46
-  59 <--x 47
-  60 <--x 47
-  61 <--x 47
-  62 <--x 47
-  63 <--x 47
-  64 <--x 47
-  65 <--x 47
-  66 <--x 47
+  55 <--x 45
+  56 <--x 45
+  57 <--x 45
+  58 <--x 45
+  59 <--x 46
+  60 <--x 46
+  61 <--x 46
+  62 <--x 46
+  63 <--x 46
+  64 <--x 46
+  65 <--x 46
+  66 <--x 46
+  51 <--x 47
+  52 <--x 47
+  53 <--x 47
+  54 <--x 47
   68 <--x 84
   72 <--x 83
 ```