RoR forms project - Update CSRF token related sections

[jg-k]

Because

Turbo is enabled by default from Rails 7 but tasks related to CSRF token in the first rails form project do not take into account default form behavior with Turbo.

This PR

• Extends the tasks of the rails form project by getting the student to submit the manually created form without then with turbo enabled to provide a better understanding of which CSRF token is needed where.
• Removes the paragraph explaining how to add a hidden input with a CSRF token from the lesson and relocates it to the project section. This avoids introducing too much details related to Turbo in the lesson, as it would extend beyond the core topic of the lesson. It is proposed to address the impact of Turbo more comprehensively separately.

Issue

Closes #28932

Additional Information

NA

Pull Request Requirements

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• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
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