Mainnet smoke/sanity tests

[piotr-iohk]

We can have some smoke/sanity tests in CI even for mainnet, example:

• create wallet > settings > lightning node > scroll to bottom > confirm expected trusted peers are listed

Context: https://synonymworkspace.slack.com/archives/C07BJ7DNPCG/p1766158087076429?thread_ts=1766157078.212349&cid=C07BJ7DNPCG