Draft: Int test refactoring(GONRG-6166)

Rustam Lotsmanenko (EPAM)requested to merge
int-test-refactoring into master
  • Created module 'testing' with sub-modules 'obm-test-core', 'obm-test-*' etc.
  • Updated README.md.
  • Updated Jackson dependencies to mitigate vulnerabilities and fix incompatibilities.

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