Add remaining integration tests to the parachain

[clangenb]

#230 introduces integration tests with the zombienets, and we run most of the tests we run on the node side too. But there are still some that we can't run:

• reputation-caching: fails as it is currently purging a community, which requires root, which the script can't handle.
• democracy: democracy params are runtime constants. As a consequence, it just takes way too long to go through the democracy lifecycle.
• bot-community:
  • we get tx-priority erros due to forks and nonce collision with the faucet service
  • sometimes we wait for too many blocks and then the phase service is already at the next phase