Implementing maximum concurrent connections for storage

[oxisto]

This needs to be enforced to 1 for our in-memory database, otherwise no such table errors are creeping up. See mattn/go-sqlite3#511 for more details.

[codecov]

Codecov Report

Merging #695 (e7ad951) into main (2b658cc) will decrease coverage by 0.09%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             main     #695      +/-   ##
==========================================
- Coverage   81.58%   81.48%   -0.10%     
==========================================
  Files          65       65              
  Lines        6032     6072      +40     
==========================================
+ Hits         4921     4948      +27     
- Misses        856      865       +9     
- Partials      255      259       +4     

Flag	Coverage Δ
unittests	81.48% <72.72%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
persistence/gorm/gorm.go	92.13% <70.00%> (-2.81%)	⬇️
persistence/inmemory/inmemory.go	100.00% <100.00%> (ø)
service/discovery/azure/azure.go	79.22% <0.00%> (-5.20%)	⬇️
api/evidence/evidence.go	70.00% <0.00%> (-1.88%)	⬇️
service/assessment/assessment.go	83.37% <0.00%> (-0.28%)	⬇️
policies/rego.go	70.38% <0.00%> (+1.12%)	⬆️

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