Prevents timeouts in ci like
https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/5516019

Related to https://github.com/paritytech/polkadot-sdk/issues/3475

Related to https://github.com/paritytech/polkadot-sdk/issues/3400

Moving all bridges testing "framework" files under one folder in order
to be able to download the entire folder when we want to add tests in
other repos

No significant functional changes

Related to https://github.com/paritytech/polkadot-sdk/issues/3400

Extracting small parts of
https://github.com/paritytech/polkadot-sdk/pull/3429 into separate PR:

- Add support for BHP local and BHK local
- Increase the timeout for the bridge zomienet tests

Related to https://github.com/paritytech/polkadot-sdk/issues/3242