Refactoring so error causality is easier to follow

[andresuribe87]

Overview

Fixes #635

[codecov-commenter]

Codecov Report

Merging #672 (c3dda71) into main (2591f0e) will not change coverage.
The diff coverage is 8.33%.

@@           Coverage Diff           @@
##             main     #672   +/-   ##
=======================================
  Coverage   25.49%   25.49%           
=======================================
  Files          56       56           
  Lines        6307     6307           
=======================================
  Hits         1608     1608           
  Misses       4421     4421           
  Partials      278      278           

Files Changed	Coverage Δ
integration/common.go	1.30% <0.00%> (ø)
internal/keyaccess/dataintegrity.go	58.33% <0.00%> (ø)
internal/keyaccess/jwt.go	43.69% <0.00%> (ø)
internal/util/crypto.go	37.50% <0.00%> (ø)
pkg/server/router/credential.go	11.93% <0.00%> (ø)
pkg/server/router/issuance.go	0.00% <0.00%> (ø)
pkg/server/router/keystore.go	10.25% <0.00%> (ø)
pkg/server/router/manifest.go	7.75% <0.00%> (ø)
pkg/server/router/presentation.go	2.38% <0.00%> (ø)
pkg/server/router/schema.go	6.72% <0.00%> (ø)
... and 11 more

[andresuribe87]

@nitro-neal or @decentralgabe could I get a stamp here plz?