Persist Group Level Security Dashboard state in URL

What does this MR do?

Persist Security Dashboard state in URL

With the help of Vue-Router we persist the URL as query parameters every time we made a successful request. Every time the user updates the URL by using the browser navigation, we update the filter state.

This is all tied together in the moderator and utilizes vue-router.

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Attention:

This deliberately does not yet persist the page parameter. The page parameter is currently not tracked in an easily accessible way, and this would mean an even bigger MR than we currently have. I'd rather deal with this in a follow up.

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Behavior:

behaviour

What are the relevant issue numbers?

Relates to #8893 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
• Security reports checked/validated by reviewer