DF-24352 new LimitDefault for Mantle

mainnet and sepolia
BumpPercent dominates BumpMin
gas_used for transmissions is ~117600 - 200k seems good

Author: vlfig

ccip/config/evm/Mantle_Mainnet.toml

@@ -12,9 +12,8 @@ HistoryDepth = 1250
 
 [GasEstimator]
 PriceMax = '120 gwei'
-# Limit values are high as Mantle's GasPrice is in native token (MNT) instead of ETH. Their proprietary TokenRatio parameter is used to adjust fees
-LimitDefault = 80_000_000_000
-LimitMax = 100_000_000_000
+# covers only L2 costs https://docs.mantle.xyz/network/system-information/fee-mechanism/fee-model-handbook-after-arsia
+LimitDefault = 200_000
 BumpMin = '100 wei'
 BumpThreshold = 60
 EIP1559DynamicFees = true

ccip/config/evm/Mantle_Sepolia.toml

@@ -12,9 +12,8 @@ HistoryDepth = 1250
 
 [GasEstimator]
 PriceMax = '120 gwei'
-# Limit values are high as Mantle's GasPrice is in native token (MNT) instead of ETH. Their proprietary TokenRatio parameter is used to adjust fees
-LimitDefault = 80000000000
-LimitMax = 100000000000
+# covers only L2 costs https://docs.mantle.xyz/network/system-information/fee-mechanism/fee-model-handbook-after-arsiaL
+LimitDefault = 200_000
 BumpMin = '100 wei'
 BumpPercent = 20
 BumpThreshold = 60