TST: Add Tests for insert and delete

Integration tests for https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/394 and caosdb-cpplib!4 (merged).

test/test_connection.cpp

@@ -110,7 +110,9 @@ TEST(test_connection, connection_ssl_authentication_error_wrong_credentials) {
 
   EXPECT_THROW_MESSAGE(
     connection.RetrieveVersionInfo(), AuthenticationError,
-    "The attempt to execute this transaction has not been executed at all because the authentication did not succeed. Original error: Authentication failed. Username or password wrong.");
+    "The attempt to execute this transaction has not been executed at all "
+    "because the authentication did not succeed. Original error: "
+    "Authentication failed. Username or password wrong.");
 }
 
 TEST(test_connection, connection_ssl_authentication_success) {