Fix infrastructure menu link to the first visible menu item

What does this MR do?

At the moment, the Infrastructure menu item link is hardcoded to the Kubernetes page. Nevertheless, if the user doesn't have enough access rights, the Kubernetes menu item won't be displayed, but the link still points to it.

We need to change that and always point to the first menu item.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.