Avoid mutating final fields

[sormuras]

Please review this change to avoid mutating final fields, by either removing the final modifier from options-related field in the console configuration helper classes or, for the time being, enabling final field mutation in Maven-based integration tests.

Closes #5173

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes

[marcphilipp]

Changes look good! Please also add an entry to the 6.0.2 release notes.