fix(rpc): getblocktemplate coinbase outputs order

[oxarbitrage]

Motivation

In #8099 we realized zcashd always put miner reward output as the first output of the coinbase.

This PR copy that behaviour for the config debug_like_zcashd mode of Zebra mining.

Close #8099

Solution

Make the miner reward transaction to appear first when using the Zebra getblocktemplate RPC method and the debug_like_zcashd flag is on (which is the default).

Tests

Existing rpc_getblocktemplate was updated to check the miner reward is the first coinbase output.

Snapshot tests were updated.

PR Author's Checklist

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.