Update the checkstyle configuration to allow suppressing specific checkstyle warnings via annotations

[npepinpe]

Description

Checkstyle does not yet properly handle the new switch expressions we have available in JDK 17. As a result, it flags such as things with INNER_ASSIGNMENT:

MyObject obj;
switch (expression) {
  VALUE -> obj = new MyObject();
  default -> obj = DEFAULT_OBJECT;
}

This check is normally for such things, where it makes sense:

MyObject obj;
if (obj = new MyObject()) {

}

For switch expressions, I think it's perfectly fine to let it assign.

To circumvent this, you can use SuppressWarnings to suppress checks for certain expressions, methods, etc. Unfortunately we need to update the configuration for this.

Additionally, please update the build pipeline so build-tools is always installed before running the checks, as otherwise the latest configuration is not picked up.