feat(content): hidden test cases

backend/data/questions/container-with-most-water.yaml

@@ -27,6 +27,12 @@ test_cases:
       expected: 36
     - input: { height: [1, 2, 4, 3] }
       expected: 4
+    - input: { height: [1, 1, 1, 1, 1, 1, 1, 1] }
+      expected: 7
+    - input: { height: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1] }
+      expected: 25
+    - input: { height: [1, 3, 2, 5, 25, 24, 5] }
+      expected: 24
 
 description: |
   You are given an integer array `height` of length `n`. There are `n` vertical lines drawn such that the two endpoints of the i<sup>th</sup> line are `(i, 0)` and `(i, height[i])`.