feat: Extend `ValidationResults` to allow write results until a max size

Description

Added two new methods to the ValidationResultFormatter:
- one to format and print the suffix
- and another to return the expected size of this suffix
Created empty default implementation for both methods not to break backwards-compatibility
Updated the write implementation to use the new formatter methods
Implemented the new methods in the TestResultFormatter and updated the test

Extend ValidationResults to allow write results until a max size

Added a new ValidationResults.write method that accepts a maxSize
- keeps writing results to the writer as usual while comparing the size of the writer to the maxSize after every append
- keeps track of the length of the writer after every append
- if the size of the writer exceeds the max size, it resets the writer to the previous length and appends a suffix with the number of remaining results.
Added a new constructor to aggregate a list of ValidationResults into one

Zeebe uses two different validators, one for design-time validations, and one for run-time validations

Currently, it calls write on the two validation results separately. But since we need to limit the size of the printed results, it would be easier to have a way to combine both results in one, and call write only once for both.