_content/learn: add Go Interview Practice to guided learning

[RezaSi]

Add Go Interview Practice to the guided learning resources.

Go Interview Practice is a free, open-source platform where developers
learn Go by solving real coding challenges. Each challenge includes a
problem description, starter template, automated tests, and hints.

The project has been active for over 1 year with:

• 1500+ pull requests from contributors worldwide
• 30+ coding challenges across different difficulty levels

The resource is referenced in official documentation of major Go
frameworks including Gin, GORM, and Fiber.

[gopherbot]

This PR (HEAD: 592e7f2) has been imported to Gerrit for code review.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/766200.
After addressing review feedback, remember to publish your drafts!

[gopherbot]

Message from Reza Shiri:

Patch Set 1:

(1 comment)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/766200.
After addressing review feedback, remember to publish your drafts!