ENH: Add -caused by- into format_short

It is necessary for various interface points to actually provide
information about exception.  E.g. if used in conjunction with

- datalad#7648
- /home/yoh/proj/misc/AnnexRemote

then we would not only obtain although quite loaded but meaningful error
result rendering:

    download_url(error): /tmp/ (file) [AccessFailedError(Failed to establish a new session 1 times. ) -caused by- HTTPSConnectionPool(host='singularity-hub.org', port=443): Max retries exceeded with url: /api/container/datalad/datalad-container:testhelper (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1000)')))] [Failed to establish a new session 1 times. ]

we would also make git-annex report the reason!:

    ❯ git annex  addurl shub://datalad/datalad-container:testhelper
    addurl shub://datalad/datalad-container:testhelper
      AccessFailedError(Failed to establish a new session 1 times. ) -caused by- HTTPSConnectionPool(host='singularity-hub.org', port=443): Max retries exceeded with url: /api/container/datalad/datalad-container:testhelper (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1000)')))
    failed
    addurl: 1 failed

datalad/support/exceptions.py

@@ -91,7 +91,10 @@ def format_short(self):
         -------
         str
         """
-        return self.name + '(' + self.message + ')'
+        s = self.name + '(' + self.message + ')'
+        if exc_cause := getattr(self.tb, '__cause__', None):
+            s += f' -caused by- {format_exception_with_cause(exc_cause)}'
+        return s
 
     def format_with_cause(self):
         """Returns a representation of the original exception including the