merge master and resolve conflicts (v8)

* master: (61 commits)
  OpenGov in Westend and Rococo (#1177)
  Associated type Hasher for `QueryPreimage`, `StorePreimage` and `Bounded` (#1720)
  Migrate polkadot-primitives to v6 (#1543)
  genesis-builder: implemented for all runtimes (#1492)
  `BlockId` removal: `tx-pool` refactor (#1678)
  Bump directories from 4.0.1 to 5.0.1 (#1656)
  Allow debug_assertions in short-benchmarks CI job (#1711)
  chainHead/storage: Fix storage iteration using the query key (#1665)
  Implement more useful traits in `Slot` type (#1595)
  Make downloads in parallel and give more time to complete (#1699)
  Bump actions/checkout from 4.0.0 to 4.1.0 (#1688)
  contracts: Fix incorrect storage alias in mirgration (#1687)
  Fix documentation about justification and `finalized == true` requirement (#1607)
  tweak pallet macro (genesis_config etc) to cater for RA users as well. (#1689)
  Uncoupling pallet-xcm from frame-system's RuntimeCall (#1684)
  Bump aes-gcm from 0.10.2 to 0.10.3 (#1681)
  docs / Update PR template to reflect monorepo (#1674)
  update contributing guide and ui-tests scripts (#1668)
  pallet epm: add `TrimmingStatus` to the mined solution (#1659)
  Update HRMP pallet benchmarking to use benchmarks v2 (#1676)
  ...