Improvement: Added the Ability to Stop Individual Techs from Appearing in the Salvage Op Tech Picker

[IllianiBird]

With the removal of Combat Technicians/Engineers players immediately voiced a need for a way to filter personnel out of the salvage tech picker dialog. This flag allows them to do so.

As of this PR only characters with the 'Salvage Supervisor' flag can participate in salvage operations. Whether this flag is enabled or disabled by default is determined by a campaign option (set to enabled by default by default).

While I was adding this flag I also spotted that we were being very inconsistent with how we were handling flag toggling. So I updated that.

[codecov]

Codecov Report

❌ Patch coverage is 2.22222% with 88 lines in your changes missing coverage. Please review.
✅ Project coverage is 11.73%. Comparing base (f130d04) to head (935faf4).
⚠️ Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
.../mekhq/gui/adapter/PersonnelTableMouseAdapter.java	0.00%	63 Missing ⚠️
...mekhq/gui/campaignOptions/contents/MarketsTab.java	0.00%	7 Missing ⚠️
MekHQ/src/mekhq/campaign/personnel/Person.java	14.28%	6 Missing ⚠️
MekHQ/src/mekhq/gui/BriefingTab.java	0.00%	6 Missing ⚠️
...ekhq/campaign/campaignOptions/CampaignOptions.java	25.00%	3 Missing ⚠️
...ign/campaignOptions/CampaignOptionsMarshaller.java	0.00%	2 Missing ⚠️
...n/campaignOptions/CampaignOptionsUnmarshaller.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8250   +/-   ##
=========================================
  Coverage     11.72%   11.73%           
- Complexity     7532     7536    +4     
=========================================
  Files          1271     1271           
  Lines        162724   162743   +19     
  Branches      24515    24526   +11     
=========================================
+ Hits          19082    19097   +15     
- Misses       141644   141648    +4     
  Partials       1998     1998           

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