image/tree: Sort image tree by name instead of creation date

[vvoland]

• related to: image/list: Show collapsed tree by default #6566

Sort images alphabetically by their repository tags rather than by creation date.

When an image has multiple tags, they are sorted internally and the first tag is used as the representative for sorting the image in the list. Untagged images are placed at the end.

- What I did

- How I did it

- How to verify it

- Human readable description for the release notes

`docker image ls --tree` now sorts images alphabetically by name instead of by creation date

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cli/command/image/tree.go	0.00%	16 Missing ⚠️

📢 Thoughts on this report? Let us know!

[thaJeztah]

Heh, still slightly confusing with multiple registries involved for the same image; looks like we may not be sorting the "per-group" list, and probably 127.0.0.1 sorted before alpine, but it's not the first one in the list of names we show 🤔

[thaJeztah]

Still; it's better than the old situation, but probably something we can follow-up on.

[thaJeztah]

LGTM