Fixed test mock instance management for RemoteRepositoryAlivenessCacheManager

[sbespalov]

Pull Request Description

This pull request closes #1671

Acceptance Test

• Building the code with mvn clean install -Dintegration.tests still works.
• Running mvn spring-boot:run in the strongbox-web-core still starts up the application correctly.
• Building the code and running the strongbox-distribution from a zip or tar.gz still works.
• The tests in the strongbox-web-integration-tests still run properly.

Questions

• Does this pull request break backward compatibility?

  • Yes
  • No

• Does this pull request require other pull requests to be merged first?

  • Yes, please see #...
  • No

• Does this require an update of the documentation?

  • Yes, please see strongbox/strongbox-docs#{PR_NUMBER}
  • No

[ghost]

DeepCode's analysis on #6cbd02 found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 1 minor issue. ✔️ 0 issues were fixed.

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[steve-todorov]

Thanks for fixing this @sbespalov ! :)

[carlspring]

@sbespalov :

Was this the same problem as #1513 ?