occasionally, we are observing build failures like:
```
17:20:54 FAILED: build/release/dist/tar/scylla-debuginfo-5.4.0~dev-0.20230522.5b2687e11800.x86_64.tar.gz
17:20:54 dist/debuginfo/scripts/create-relocatable-package.py --mode release 'build/release/dist/tar/scylla-debuginfo-5.4.0~dev-0.20230522.5b2687e11800.x86_64.tar.gz'
17:20:54 Traceback (most recent call last):
17:20:54 File "/jenkins/workspace/scylla-master/scylla-ci/scylla/dist/debuginfo/scripts/create-relocatable-package.py", line 60, in <module>
17:20:54 os.makedirs(f'build/{SCYLLA_DIR}')
17:20:54 File "<frozen os>", line 225, in makedirs
17:20:54 FileExistsError: [Errno 17] File exists: 'build/scylla-debuginfo-package'
```
to understand the root cause better, instead of swallowing the error,
let's raise the exception it is not caused by non-existing directory.
a similar change was applied to scripts/create-relocatable-package.py
in a0b8aa9b13. which was correct per-se.
but the original intention was to understand the root cause of the
failure when packaging scylla-debuginfo-*.tar.gz, which is created
by the dist/debuginfo/scripts/create-relocatable-package.py.
so, in this change, the change is ported to this script.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes#14082
037113f752