refactor: remove redundant err.Error() calls

[ravencore06]

Description

Remove redundant err.Error() calls when formatting errors in
cmd/podman/root.go and pkg/domain/infra/abi/generate.go.

The errors are passed directly to the formatting functions using %v,
following idiomatic Go error formatting and the existing Podman style.

Changes

• Replace redundant err.Error() calls with %v and err.
• No functional behavior is changed.
• No unrelated code was modified.

Validation

• git diff --check passes.
• Local Go tests were not run because Go is not installed in the current development environment.

[Honny1]

At first glance, the idea/code of change seems to be correct. But please follow our contribution guidelines and LLM policy.

For example, please squash all commits and refer to the issue (if exsits) in the commit msg in way Fixes: #NUMBER_OF_ISSUE, properly sign the commit, etc.