Chore: Replace relative imports with absoute imports

[TeddyRoncin]

@/ suffix represents the src/ root directory.
#/ suffix represents the test/ root directory.
Added the eslint plugin importPlugin for import order (but disable for now, because ESLint 10 is not yet supported, see import-js/eslint-plugin-import#3230)

[codecov]

Codecov Report

❌ Patch coverage is 98.37997% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.98%. Comparing base (62cb21e) to head (4ab39df).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/main.ts	0.00%	3 Missing ⚠️
src/config/config.service.ts	0.00%	0 Missing and 2 partials ⚠️
test/e2e/branch/get-branches.e2e-spec.ts	0.00%	2 Missing ⚠️
...st/e2e/ue/credit/get-credit-categories.e2e-spec.ts	0.00%	2 Missing ⚠️
test/e2e/branch/index.ts	0.00%	1 Missing ⚠️
test/e2e/ue/credit/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #126      +/-   ##
==========================================
+ Coverage   79.77%   85.98%   +6.21%     
==========================================
  Files          96      195      +99     
  Lines        2294     5201    +2907     
  Branches      409      499      +90     
==========================================
+ Hits         1830     4472    +2642     
- Misses        380      568     +188     
- Partials       84      161      +77     

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