**As** a system operator
**I want to** delete old versions of semantic project identifiers, which are still resolved by the system after rename operations
**so that** I may use the name for new or existing project.

**Acceptance criteria**

* `/admin/settings/project_reserved_identifiers` Begin of the insertionnow shows up inEnd of the insertion Begin of the deletion is updated supportEnd of the deletion semantic Begin of the insertionmode

* It lists every historical project identifier across both classic andEnd of the insertion Begin of the deletion mode, listing only reservedEnd of the deletion semantic Begin of the insertionmodes -- even those that were active in first mode when it got converted to second mode

* Unreleasing an identifier breaks all previous URLs that used it, including the semantic work package links

* example: 

1. OLDPROJ (with WP OLDPROJ-1) gets renamed to NEWPROJ (with WP NEWPROJ-1)

2. Links containing OLDPROJ or OLDPROJ-1 resolve correctly

3. The OLDPROJ identifier is released

4. Links containing OLDPROJ or OLDPROJ-1 get a 404

* Also, the term "release" is replaced with "unreserve"End of the insertion Begin of the deletion identifiersEnd of the deletion


**Technical notes**

* We need to:

* Delete that old slug from the `FriendlyId` table

* Delete all relevant entries from the `WorkPackageAlias` table