Simplified Tech Personnel Checks

[IllianiCBT]

Removed experience level checks from tech personnel checks to streamline the determination of technician roles. This removes the really weird situation where ultra-green techs can't be assigned to units (or, in some cases, repair tasks). Whether they should be assigned is something best left to the player. This was particularly odd, as this is the only role that had the 'must be Green or better' restriction.

[IllianiCBT]

For the curious, this was why sometimes you'd end up with techs not assigned to units, when using the company generator.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.45%. Comparing base (2b9ba00) to head (4103d14).
Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4911   +/-   ##
=========================================
  Coverage     10.45%   10.45%           
+ Complexity     6006     6005    -1     
=========================================
  Files           952      952           
  Lines        132755   132753    -2     
  Branches      19308    19304    -4     
=========================================
  Hits          13882    13882           
+ Misses       117527   117523    -4     
- Partials       1346     1348    +2     

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