Description

Fixes two significant regressions in Spring codegen:

1. After Divide Spring unit and integration testing in codegen #2230 I introduced a bug that lateinit variable mockitoCloseableVariable is not initialized. Fixed in CgSpringUnitTestClassConstructor.

2. After Fix StackOverflow errors in models with mocks processing #2157 I introduced a bug with missing mocks, now reverting changes. Stack overflow related problems still need to be fixed in Incorrect mocks are created for test with ToStringCreator.append #2158

How to test

Automated tests

Codegen regression on spring-petclinic and similar projects.

Manual tests

Manual verification of generated tests.

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.