Refactor `JsonPrettyPrinter` to be usable in CustomToolJson

[jan-vcapgemini]

IDEasy/cli/src/main/java/com/devonfw/tools/ide/repo/CustomToolsJsonMapper.java

Line 32 in 5c9c80b

MAPPER.writerWithDefaultPrettyPrinter().writeValue(writer, customTools);

          Shouldn't we use the `JsonPrettyPrinter` here too?

Originally posted by @jan-vcapgemini in #820 (comment)