## Changes
Fix all errcheck-found issues in tests and test helpers. Mostly this
done by adding require.NoError(t, err), sometimes panic() where t object
is not available).
Initial change is obtained with aider+claude, then manually reviewed and
cleaned up.
## Tests
Existing tests.
## Changes
The `any` alias for `interface{}` has been around since Go 1.18.
Now that we're using golangci-lint (#1953), we can lint on it.
Existing commits can be updated with:
```
gofmt -w -r 'interface{} -> any' .
```
## Tests
n/a
Denis Bilenko
Pieter Noordhuis