chore(gnovm) Migrate gno.land txtar tests to realm file tests

[deelawn]

Description

We have txtar tests in gno.land/cmd/gnoland/testdata. Many, maybe all, can be migrated to the tests located at gnovm/cmd/gno/testdata/gno_test as realm file tests. These tests exist to test realm finalization within the gnovm so we can move them under the vm parent directory to make this more clear.