Fix prohibiting Nomad Job recreation with delay in between

[mpass99]

by not purging a job once its allocation stops (and maybe would be replaced).

Related to #673

Scenario: Deleting and Creating the environment before each restart
Before PR
1 - 0/5
2 - 0/5
3 - 0/5
4 - 0/5
5 - 0/5

After PR
1 - 5/5
2 - 5/5
3 - 5/5 (one slow recreation)
4 - 5/5
5 - 5/5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.19%. Comparing base (43e6a3e) to head (9bea900).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #680   +/-   ##
=======================================
  Coverage   76.19%   76.19%           
=======================================
  Files          43       43           
  Lines        3592     3592           
=======================================
  Hits         2737     2737           
  Misses        625      625           
  Partials      230      230           

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[MrSerth]

Looks good, thanks! 🪴