fix(v2): use dnf -q list --installed for accurate package detection

[leaanthony]

Summary

• Replaces dnf info installed <pkg> with dnf -q list --installed <pkg> in the dnf package manager
• The previous command returned available packages with version info even when not installed, causing wails doctor to falsely report packages as installed on Fedora/RHEL
• The new command returns exit code 1 when a package is not installed, providing accurate detection

Test plan

• New tests in v2/test/4457/dnf_test.go using mock dnf scripts verify:
  1. Exit code 1 (not installed) → PackageInstalled returns false
  2. Exit code 0 with installed output → PackageInstalled returns true
  3. The new approach correctly rejects packages that the old approach would falsely detect

Fixes #4457

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[leaanthony]

🤖 PR Triage Review

✅ Accepted

Uses dnf -q list --installed for accurate package detection (v2 Linux). Fixes RPM-based distro support.

Platform: Linux (v2)

Next Steps: Dispatching for Linux testing.

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Reviewed by Wails PR Reviewer Bot