eligibleTapAmount = position.amount * gaugeTotalForEpoch / totalPoolDeposited

- position.amount: The locked amount of the position in `sglAssetId`.
- gaugeTotalForEpoch: The total number of TAP tokens that can be minted for the `(epoch, sglAssetId)`.
- totalPoolDeposited: The total locked amount of all positions in `sglAssetId`.
