add -show-url option for ui command

[yaroot]

closes #11193

[lgfa29]

Thank you for the PR @yaroot!

From my test, there's a duplicate message with the URL when the new flag is passed. I have a suggestion on how we can avoid it, but feel free to implement it another way if you find a better solution 🙂

[lgfa29]

Thank you for the fix @yaroot, things are working as expected now 🙂

I pushed a couple of commits to enhance the documentation and also to add a CHANGELOG entry.

Thank you for the contribution!

[github-actions]

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