Feat/add dry run docs

[zihanKuang]

This PR adds a page for the “Dry Run” functionality in Meshery's design workflows. The guide explains what Dry Run does, how to use it, and how it differs from Validate and Deploy.

What's Included

• Supporting images (GIF + PNGs) for UI walkthroughs

• Usage explanation with screenshots

• Q&A and footnotes for known UI behaviors

• The section “How It Works” reflects the real execution flow based on these implementations: https://github.com/meshery/meshery/blob/master/ui/machines/validator/designValidator.js https://github.com/meshery/meshery/blob/ec5eea1a098b12afdafe93cf1b821da99a3f6bfc/server/handlers/design_engine_handler.go https://github.com/meshery/meshery/blob/72ad171fa7ae0975d3ffa57b7b27da37e4be70c0/server/models/pattern/patterns/k8s/k8s.go

• [x] Yes, I signed my commits.

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[zihanKuang]

Hi @leecalcote @hortison, thanks a lot for the helpful feedback!

I've updated the PR based on your suggestions:

• Removed the unnecessary alias.
• Reworded headings and adjusted the tone for a more natural, user-focused voice.
• Converted the Best Practices section into a numbered list.

Also, I’ve opened an issue to track the dropdown behavior mentioned in the footnote: #14584

Let me know if there's anything else I can improve.

[pontusringblom]

Thanks for reviewing, @Paladian78

[leecalcote]

Regarding the difference in behavior on the Actions button - - https://cloud.layer5.io/academy/learning-paths/mastering-meshery/introduction-to-meshery?chapter=deploying-meshery-designs

The single-click action offers away for experienced users to bypass a wizard and simply directly invoke the selected action.

[zihanKuang]

We'll hold off on further doc updates to this section until issue #14634 is resolved 😎