syntax improvement

show %s for miners and stakers, better formatting, show the thru-blockheight

@bot guix-linux

remove useless return, fix comment nit, use MainNet testing setup for new test (needed after changing HasCheckPoint in parent diff)

Fix the CI guix-linux build

use GetRequireHeight in HasCheckpoint

check last checkpoint height to decide whether checkpoints should be validated
This requires a unit test to now use the MainNet params.

change explorer for testnet, addr prefix in app config, disable swap page

@bot guix-linux

I'm very happy to see this happen but there is no way to review such a change. You really need to split it into pieces, starting with running the ecash-lib integration tests properly on CI when there is a relevant change, which seems to not be the case here.
Then you can go through the list that is in the summary.

add rust-secp256k1 to the rust workspace

-,

Build Bitcoin ABC Diffs / Diff Testing (preview-explorer) passed.
Preview is available at http://51.178.130.230:41751 for the next 60 minutes.

@bot preview-explorer

no need to cache blk_invalidated, remove '2*' factor for ttl

For the next follow-up: you can remove the memoryCache entry for the block status as well as it's no longer needed

There clearly was an attempt to make the thread sleep longer if there is no processing to do, but the implementation failed. In any case > 5s of delay should be enough to not create any meaningful load on the CPU even with hundreds of crawlers.

The address handling seems incomplete but otherwise looks ok

rebase

Add a release note

This will need a release note