Adds the sentry docs page to the frontend guidelines

What does this MR do and why?

This MR adds a page to the frontend guidelines for how to use sentry. There's missing information in there right now, but it gives us a better platform to iterate on and add these sections

Screenshots or screen recordings

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Before	After
no page

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Set up the GDK
2. Set up the docs
3. Navigate to [your docs url]/ee/development/fe_guide/sentry.html

Alternatively, go here: https://main-ee-129001.docs.gitlab-review.app/ee/development/fe_guide/sentry.html

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.