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cmake: fix search patterns used by ctest

In CMake command `file(GLOB_RECURSE ...)` latest unnamed arguments
are search patterns `<globbing-expressions>` [1]. In the patch
with initial CTest support, the pattern
`${PROJECT_SOURCE_DIR}/test` was used and with commands below:

```
$ mkdir -p {a,b}/my
$ touch {a,b}/my/test
$ cmake .
```

this leads to an error:

```
-- Add regression tests
CMake Error at test/CMakeLists.txt:196 (add_test):
  add_test given test NAME "test/my/test" which already exists in this
  directory.
```

The patch fixes the problem. Follows up commit a9b9f2eb4f71
("test: execute tests using CTest").

1. https://cmake.org/cmake/help/latest/command/file.html#glob-recurse

NO_CHANGELOG=testing
NO_DOC=testing
NO_TEST=testing

Reported-by: Alexander Turenko <alexander.turenko@tarantool.org>
Reported-by: Sergey Kaplun <skaplun@tarantool.org>

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