Force install from Plugins tab, add MIT license to plugin template

[jmthomas]

closes #412

[codecov]

Codecov Report

Base: 74.74% // Head: 74.70% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (19dc682) compared to base (39181f1).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #426      +/-   ##
==========================================
- Coverage   74.74%   74.70%   -0.04%     
==========================================
  Files         455      455              
  Lines       27671    27671              
  Branches      592      592              
==========================================
- Hits        20682    20673       -9     
- Misses       6896     6904       +8     
- Partials       93       94       +1     

Flag	Coverage Δ
frontend	75.97% <ø> (-0.19%)	⬇️
ruby-api	50.24% <0.00%> (ø)
ruby-backend	78.85% <ø> (ø)

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Impacted Files	Coverage Δ
...-cmd-tlm-api/app/controllers/plugins_controller.rb	20.45% <0.00%> (ø)
...smos-tool-calendar/src/tools/Calendar/Calendar.vue	66.21% <0.00%> (-6.09%)	⬇️

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