Handle exception when building amazon documentation (#50417)

There was an exception thrown when importing example dags when
generating amazon documentation, which prevented the documentation
build to generate link to sources of embedded examples.

The exception was caused by raising an exception while trying to
handle another exeception.

Author: potiuk

providers/amazon/tests/system/amazon/aws/utils/__init__.py

@@ -113,13 +113,13 @@ def _fetch_from_ssm(key: str, test_name: str | None = None) -> str:
         log.info("No boto credentials found: %s", e)
     except ClientError as e:
         log.info("Client error when connecting to SSM: %s", e)
-    except hook.conn.exceptions.ParameterNotFound as e:
-        log.info("SSM does not contain any parameter for this test: %s", e)
     except KeyError as e:
         log.info(
             "SSM contains one parameter for this test, but not the requested value: %s",
             e,
         )
+    except Exception as e:
+        log.info("SSM does not contain any parameter for this test: %s", e)
     return value