Draft: Switch incident details to use vue-router

What does this MR do and why?

This is a POC of switching incident_tabs.vue from GlTabs to vue-router.

Screenshots or screen recordings

Screen_Recording_2022-09-22_at_08.24.02

How to set up and validate locally

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

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 #367856