[Tests] Fix sync_tests header include

bb3967f5 [Trivial][Cleanup] Complete CStakerStatus::SetNull() (random-zebra)
52c36d4d [RPC] Fix mnsync check in getstakingstatus (random-zebra)
993e06ee [Doc] Document changes to getstakingstatus output (random-zebra)
ce6069cb [RPC] getstakingstatus: add stakesplitthreshold and coldstaking_enabled (random-zebra)
d2985dc8 [RPC] getstakingstatus: stakeablecoins and stakingbalance (random-zebra)
c9008da6 [PoS][RPC] Staker Status: Add number of stakeable utxos hashed/available (random-zebra)
fa7df1df [RPC] getstakingstatus: refactor lastAttempt attributes (random-zebra)

Pull request description:

  Add the number of staked/available coins during last attempt to `CStakerStatus`.

  Remove the following attributes from `getstakingstatus` output
   - "tiptime"
   - "hashLastStakeAttempt"
   - "heightLastStakeAttempt"
   - "timeLastStakeAttempt"

  Add the following attributes to `getstakingstatus` output:
    - "lastattempt_age" (numeric, seconds since last stake attempt)
    - "lastattempt_depth" (numeric, depth of the block on top of which the last stake attempt was made)
    - "lastattempt_hash" (hex string, hash of the block on top of which the last stake attempt was made)
    - "lastattempt_coins" (numeric, number of stakeable coins available during last stake attempt)
    - "lastattempt_tries" (numeric, number of stakeable coins checked during last stake attempt)
    - "stakeablecoins" (numeric, number of stakeable UTXOs)
    - "stakingbalance" (numeric, PIV value of the stakeable coins, minus reserve balance, if any)
    - "stakesplitthreshold" (numeric, value of the current threshold for stake split)
    - "coldstaking_enabled" ((boolean, whether cold-staking is enabled/disabled in pivx.conf)

ACKs for top commit:
  Fuzzbawls:
    ACK bb3967f5

Tree-SHA512: 3d90cb08043448611498dc90486af5ab8b712851f29a74d1c1cd6372f19b08fba84f6d8e29776e0028ed83209362ea9707121804865d3db2eb96a8082eab10f1

Time Protocolv2