Make dashboards support deep linking

[madsrasmussen]

This PR makes dashboards support deep linking. It adds the alias as a query param when switching between dashboards and loads the correct dashboard on page load.

How to test:

• Make sure you can change dashboards in each section.
• Make sure the query params get updated with the dashboard alias
• Make sure you can link directly to a dashboard
• Make sure the first dashboard is active if you don't have a dashboard query param or type in a random alias

[umbrabot]

Hi there @madsrasmussen, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
• The level of security for this contribution is the same or improved
• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
• If this is a new feature, Umbraco HQ provided guidance on the implementation beforehand
• The contribution looks original and the contributor is presumably allowed to share it

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[nathanwoulfe]

@madsrasmussen I tried changing the base branch to v8/contrib so I can merge, but that picked up an additional commit (so I flipped back to v8/dev). Reckon you could change the base and address the additional commit?

This is a great addition, it's something I've tried to hack around in packages so will be brilliant to have in core.

[nielslyngsoe]

Cool, tested and it works well. Even if you are not logged in you are still getting to the right dashboard when logging in.