Support new admin projects dashboard routes

What does this MR do and why?

Adds the following routes:

• /admin/projects/active
• /admin/projects/inactive

This is necessary to support the new pages added in Migrate Admin Projects Dashboard to Vue (!194685 - merged)

References

• Closes #541495 (closed)

Screenshots or screen recordings

N/A

How to set up and validate locally

1. Go to /admin/projects/active. The admin projects dashboard should load normally.
2. Go to /admin/projects/inactive. The admin projects dashboard should load normally.

Currently, it will load the existing HTML-based dashboard. When Migrate Admin Projects Dashboard to Vue (!194685 - merged) is merged, they should load the "Active" and "Inactive" tabs respectively.

MR acceptance checklist

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