Bridges: Remove obsolete relayer CLI args: host, port, path, secure

[rosarp]

Closes: #7291

Description

Removes obsolete relayer CLI args from bridges and resolves following issue: (#7291)

[serban300]

Looks good !

We should also take a note in #7291 to update the bridge zombienet tests after a new version of the relayer is published: polkadot-sdk , fellowship/runtimes and also the CI team might need to update the setup for the Polkadot-Kusama relayers.

Also did you run the polkadot-sdk zombienet tests to make sure that they work with this change ? They don't automatically run in the CI, because in the CI we use an older version of the relayer.

[bkontur]

also the CI team might need to update the setup for the Polkadot-Kusama relayers.

We've checked this already, it uses just uri.

We should also take a note in #7291 to update the bridge zombienet tests after a new version of the relayer is published: polkadot-sdk , fellowship/runtimes

exactly, when we upgrade bridges repo paritytech/parity-bridges-common#3104 + this PR

[bkontur]

@rosarp please update also:

• remove bridges/testing/scripts/start-relayer.sh
• remove function run_relay and its usage
• change init functions to use uri instead of port/host here: https://github.com/paritytech/polkadot-sdk/blob/master/bridges/testing/environments/rococo-westend/bridges_rococo_westend.sh#L157-L179 (so the continuous-integration/gitlab-zombienet-bridges-0001-asset-transfer-works passes)