Dismiss Web IDE callout when clicking Try it out button

What does this MR do and why?

It dismisses the Web IDE callout when clicking the Try it out link:

This change is inspired by some users having trouble closing the pop-up by clicking the X button when using certain browser extensions. See #388230 (closed) for more details.

How to set up and validate locally

1. Start the rails console rails c.
2. Enable the vscode_web_ide feature flag.
3. Clean all the callouts by running Users::Callout.delete_all() (still in the rails console).
4. Open a project. The popup should appear.
5. When you click the Try it out, it will dismiss the callout.

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.

Related to #388230 (closed)