fix: Raise the underlying urlerror while downloading example file (#4396)

While downloading the example file, if there is an
`urllib.error.URLError` due to an `SSLError`, raise the underlying
`SSLError`. For all other cases raise `RemoteFileNotFoundError` as
before.

Example SSLError:
```
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1007)
```

Showing the underlying error will help users to triage connection issues
in their system, e.g. the above error is due to CA certificates are not
installed on the system.

Fluent bug - 1320755

---------

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: mkundu1

doc/changelog.d/4396.fixed.md

@@ -0,0 +1 @@
+Raise the underlying urlerror while downloading example file

src/ansys/fluent/core/utils/networking.py

@@ -25,6 +25,7 @@
 from concurrent import futures
 import logging
 import socket
+import ssl
 from typing import Any
 import urllib.request
 
@@ -130,12 +131,20 @@ def check_url_exists(url: str) -> bool:
     -------
     bool
         True if the URL exists, False otherwise
+
+    Raises
+    ------
+    ssl.SSLError
+        If there is an SSL error while checking the URL
     """
     try:
         with urllib.request.urlopen(url) as response:
             return response.status == 200
-    except Exception:
-        return False
+    except urllib.error.URLError as ex:
+        if ex.__context__ and isinstance(ex.__context__, ssl.SSLError):
+            raise ex.__context__
+        else:
+            return False
 
 
 def get_url_content(url: str) -> str: