DISABLED_TEST_CASE

## Description
It would be nice to have solution build in for diabling tests. Not hiding them because when you hide only and pass eg. to not run [~long] tests cases then hidden will be executed.

### Extra information
Sample implementation
```
#pragma once

#define CONCAT_(x, y) x##y
#define CONCAT(x, y) CONCAT_(x,y)

#define DISABLED_TEST_CASE(...) __attribute__ ((unused)) static void CONCAT(disabled_test_,__LINE__)()
```

No source file or test is named. Start by tracing Catch2's test-case registration and test-selection behavior, then compare it with the proposed DISABLED_TEST_CASE macro. Done means disabled cases are supported without being hidden and remain excluded when selecting or excluding long tests.

Written by the indexing model from the issue text.