Skip BS popover global init in app/views/layouts/nav/sidebar/_project.html.haml

What does this MR do?

This removes the data-toggle="popover" attribute from Kubernetes menu item's feature highlight. This attribute controls Bootstrap popovers' initialization, however it appears that this particular popover is being initialized in app/assets/javascripts/feature_highlight/feature_highlight.js, which makes the data attribute redundant.

The migration to GlPopover will have to be handled as part of #227259 (closed)

Screenshots (strongly suggested)

Before	After

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Related to #251104 (closed)