RTEMS | BUILD_VALIDATIONTESTS is broken (#5568)

[Chris Johns (@chris)]

Chris Johns created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5568



## Summary

The config item `BUILD_VALIDATIONTESTS` is broken if tests are enabled and this setting it set to `False`.

This bug shows a lack of testing of these options and poor separation of dependencies and the options. The unit tests seems to be a dependent on `testsuites/validation`. The documentation for these options does not indicate an dependency:

```
# Build the unit test programs (may be also enabled by BUILD_TESTS)
BUILD_UNITTESTS = False
# Build the validation test programs (may be also enabled by
# BUILD_TESTS)
BUILD_VALIDATIONTESTS = False
```

I have no idea what the role of this unit test group of tests is and how they relate to the groups that have existed in RTEMS for decades? The eng manual offers little useful information. I did find [specification language chat](https://docs.rtems.org/docs/main/eng/req/items.html#unit-test-link-role) but this actually says little more than what is obvious.

## Steps to reproduce

Use the following in a configuration INI file:

```
[DEFAULT]
RTEMS_POSIX_API = True
RTEMS_DEBUG = True
BUILD_TESTS = True
BUILD_TMTESTS = False
BUILD_VALIDATIONTESTS = False
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5568
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