[Backend] Resolve CA1711, CA1725, CA2215, CA2229

[imnasnainaec]

Parts of #2111

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This change is 

[codecov-commenter]

Codecov Report

Patch coverage: 27.27% and project coverage change: +14.43 🎉

Comparison is base (494da2a) 46.45% compared to head (2f572ed) 60.89%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2328       +/-   ##
===========================================
+ Coverage   46.45%   60.89%   +14.43%     
===========================================
  Files         198      243       +45     
  Lines        3954     8236     +4282     
  Branches      514      514               
===========================================
+ Hits         1837     5015     +3178     
- Misses       1740     2844     +1104     
  Partials      377      377               

Flag	Coverage Δ
backend	74.21% <27.27%> (?)
frontend	46.45% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Backend/Helper/FileOperations.cs	81.96% <0.00%> (ø)
Backend/Helper/LiftHelper.cs	86.66% <0.00%> (ø)
Backend/Models/UserRole.cs	100.00% <ø> (ø)
Backend/Services/LiftService.cs	93.85% <0.00%> (ø)
Backend/Services/MergeService.cs	76.51% <0.00%> (ø)
Backend/Services/PermissionService.cs	0.00% <0.00%> (ø)
Backend/Helper/FileStorage.cs	96.55% <25.00%> (ø)
Backend/Services/UserEditService.cs	75.00% <100.00%> (ø)

... and 37 files with indirect coverage changes

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[jasonleenaylor]

Reviewed 5 of 6 files at r1, 4 of 4 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[jasonleenaylor]

Reviewed 4 of 4 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)