feat(ui): replace legacy product tour with onboarding v2

[proddata]

• remove legacy VueTour flow and obsolete onboarding button components

resolves #14558
Closes #9874.

[github-actions]

🐋 Docker image

ghcr.io/kestra-io/kestra-pr:14581

docker run --pull=always --rm -it -p 8080:8080 --user=root -v /var/run/docker.sock:/var/run/docker.sock -v /tmp:/tmp ghcr.io/kestra-io/kestra-pr:14581 server local

[MilosPaunovic]

I've swiftly glanced through the code - that part looks alright so far in terms you're on point when it comes to things that need changing. Would have to give it a more thorough look once it's ready for review, especially because there's a lot of files affected by the PR.

Speaking about the behavior - I do like it very much, makes things easier for users to get the idea of what Kestra is and how it's supposed to work.

Below are some minor details I've notice during the test:

• This badge is not visible enough on dark mode

• Starting the tutorial shows the dialog before the redirection to editor
  Screencast from 2026-02-13 09-14-04.webm

• There is a Complete label at the bottom of dialog which I'm not sure what's the purpose of

Okay, I figured out after the step where I had to type something in, maybe a bit of design change where we don't show it when there's no user interaction needed.

• It was not clear to me that I should type the id field because the editor is not in the foreground here, but looks like it's either disabled or only in the background

• There's console errors when I moved to this step

• Here, a little highlighting of Save button might not hurt

• Same goes for the next step about executing.

• Overlapping of dialogs - not good

Overall, beside those little things, this was an excellent job so far @proddata! 🚀

[MilosPaunovic]

And this PR will also close #9874, so I'll add it into description.