Remove duplicated admin api route for batch delete users

[innerdvations]

What does it do?

deletes an admin API route from roles that already exists in users and should only exist there; they're identical

Why is it needed?

the route shouldn't be there; not safe to have the same route in two places and was probably a mistake

Looking at the history of what happened here, it looks like all the routes were in one file, then role batch delete was removed, and then it was split up into separate files and users batch delete got copied to two places. So it feels like we should update this with a roles batch delete, except that we're not using it anywhere, so there's no reason for it to exist.

How to test it?

Admin API batch delete users call should still work

Related issue(s)/PR(s)

[codecov]

Codecov Report

Base: 60.49% // Head: 60.49% // No change to project coverage 👍

Coverage data is based on head (43c6874) compared to base (b76c413).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14276   +/-   ##
=======================================
  Coverage   60.49%   60.49%           
=======================================
  Files        1352     1352           
  Lines       33174    33174           
  Branches     6337     6337           
=======================================
  Hits        20070    20070           
  Misses      11271    11271           
  Partials     1833     1833           

Flag	Coverage Δ
back	50.35% <ø> (ø)
front	65.05% <ø> (ø)
unit_back	50.35% <ø> (ø)
unit_front	65.05% <ø> (ø)

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