Write a Python function `combinations_with_repetition` that takes in two arguments:
1. A list of elements `lst`.
2. An integer `n` representing the length of the combinations.
The function should generate all possible combinations (with repetition) of the elements in the list of length `n` and return them as a list of tuples.
#### Example Usage
```python [main.nopy]
combinations_with_repetition(["Red", "Green", "Blue"], 1)
# Expected output: [("Red",), ("Green",), ("Blue",)]
combinations_with_repetition(["Red", "Green", "Blue"], 2)
# Expected output: [("Red", "Red"), ("Red", "Green"), ("Red", "Blue"), ("Green", "Green"), ("Green", "Blue"), ("Blue", "Blue")]
combinations_with_repetition(["Red", "Green", "Blue"], 3)
# Expected output: [("Red", "Red", "Red"), ("Red", "Red", "Green"), ("Red", "Red", "Blue"), ("Red", "Green", "Green"), ("Red", "Green", "Blue"), ("Red", "Blue", "Blue"), ("Green", "Green", "Green"), ("Green", "Green", "Blue"), ("Green", "Blue", "Blue"), ("Blue", "Blue", "Blue")]
```