chore(params,version): v2.8.0 testnet config

[benjamin202410]

Summary

• params/config_networks.go: Add testnet V2 config entry at switch round 27360000 with updated masternode/protector/observer reward parameters, penalty and signing thresholds
• params/config_networks.go: Enable Prague, DynamicGasLimit, TIPUpgradeReward, and TIPUpgradePenalty forks at block 83600000 on testnet
• version/version.go: Bump version from 2.7.0-devnet → 2.8.0-testnet

Changes in detail

New V2 config entry (TestnetV2Configs[27360000])

Field	Value
MaxMasternodes	25
MaxProtectorNodes	3
MaxObserverNodes	2
SwitchRound	27360000
CertThreshold	0.667
TimeoutSyncThreshold	3
TimeoutPeriod	10
MinePeriod	2
MasternodeReward	63.42
ProtectorReward	50.27
ObserverReward	25.13
MinimumMinerBlockPerEpoch	5
LimitPenaltyEpoch	5
MinimumSigningTx	30

Fork activations at block 83600000 (testnet ChainConfig)

• PragueBlock: nil → 83600000
• DynamicGasLimitBlock: nil → 83600000
• TIPUpgradeRewardBlock: nil → 83600000
• TIPUpgradePenaltyBlock: nil → 83600000

Test plan

• Node syncs on testnet past round 27360000 with new V2 config applied
• Node activates Prague/DynamicGasLimit/Reward/Penalty upgrades at block 83600000
• XDC version reports 2.8.0-testnet

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch v2.8.0-testnet-config-v2

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