chore(examples): use std.GetChainDomain()

[moul]

• ⚠️ TODO: decide if we keep tests.gno.land as the gno test domain
• fix txlink etc to make valid remote links (missinghttps)

Related with #2911

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[moul]

I am still considering whether to keep tests.gno.land as the Gno test domain. Additionally, I am thinking about what we should do now, rather than in the future, regarding domain names for the various existing and upcoming networks.

[thehowl]

Well, for gno test, I think that imports should use the loader norman's working on; and that the name of the package being tested should be determined by gno.mod. So, not necessarily tests.gno.land, just configured by the user?