rmi: reject docker transport image references

[Rajkaran-122]

Summary

• Update podman rmi to reject docker:// image references before image removal is attempted.
• This avoids the generic "unsupported transport" error and returns a clearer error indicating that transport-qualified
• image references are not supported for local image removal.
• An e2e test has been added to cover this behavior.

Referenced issue:
Non-actionable error message: 'Error: unsupported transport "docker" for looking up local images' #20775

Checklist

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• Certify you wrote the patch or otherwise have the right to pass it on as an open-source patch by signing all
  commits. (git commit -s). (If needed, use git commit -s --amend). The author email must match
  the sign-off email address. See CONTRIBUTING.md
  for more information.
• Referenced issues using Fixes: #00000 in commit message (if applicable)
• Tests have been added/updated (or no tests are needed)
• Documentation has been updated (or no documentation changes are needed)
• All commits pass make validatepr (format/lint checks)
• Release note entered in the section below (or None if no user-facing changes)

Does this PR introduce a user-facing change?

Does this PR introduce a user-facing change?

When `podman rmi` is invoked with `docker://{image}`, a clearer error is now returned instead of the generic unsupported transport error.

[Luap99]

#29334 (review)

in general similar chnage would be nice to consolidate into one PR so we can have that discussion once, using muliple commit per command itself is fine