Add Tech/Vessel Column to Tech Skills View

[IllianiCBT]

Current Implementation

Currently the Tech Skills view has the following tabs:

Problem

This makes it difficult to find those employees with the Tech/Vessel skill.

Solution

Added Tech/Vessel column

Also added appropriate Unit Test.

Closes #3890.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 10.60%. Comparing base (0a2b4e4) to head (1d910d1).
Report is 8 commits behind head on master.

Files	Patch %	Lines
...src/mekhq/gui/enums/PersonnelTableModelColumn.java	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3916   +/-   ##
=========================================
  Coverage     10.60%   10.60%           
- Complexity     5487     5489    +2     
=========================================
  Files           836      836           
  Lines        114266   114271    +5     
  Branches      17182    17183    +1     
=========================================
+ Hits          12121    12123    +2     
- Misses       100935   100938    +3     
  Partials       1210     1210           

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