[Tests] Moved battery pack variants definition to a separated file

- To use with import

tests/yaml_samples/battery_pack_sub_pcbs.kibot.yaml

@@ -0,0 +1,23 @@
+kibot:
+  version: 1
+
+variants:
+  - name: 'default'
+    comment: 'Default variant'
+    type: ibom
+    sub_pcbs:
+      - name: charger
+        tlx: 175
+        tly: 50
+        brx: 245
+        bry: 90
+      - name: battery
+        tlx: 20
+        tly: 20
+        brx: 90
+        bry: 118
+      - name: connector
+        tlx: 116
+        tly: 52
+        brx: 146
+        bry: 88

tests/yaml_samples/drill_sub_pcb.kibot.yaml

@@ -2,26 +2,8 @@
 kibot:
   version: 1
 
-variants:
+import:
-  - name: 'default'
+  - file: battery_pack_sub_pcbs.kibot.yaml
-    comment: 'Default variant'
-    type: ibom
-    sub_pcbs:
-      - name: charger
-        tlx: 175
-        tly: 50
-        brx: 245
-        bry: 90
-      - name: battery
-        tlx: 20
-        tly: 20
-        brx: 90
-        bry: 118
-      - name: connector
-        tlx: 116
-        tly: 52
-        brx: 146
-        bry: 88
 
 outputs:
   - name: excellon_drill