core: make NotifyAccess= and FileDescriptorStoreMax= available to transient services

This is helpful for debugging/testing #5606.

src/shared/bus-unit-util.c

@@ -266,7 +266,8 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
                               "StandardInput", "StandardOutput", "StandardError",
                               "Description", "Slice", "Type", "WorkingDirectory",
                               "RootDirectory", "SyslogIdentifier", "ProtectSystem",
-                              "ProtectHome", "SELinuxContext", "Restart", "RootImage"))
+                              "ProtectHome", "SELinuxContext", "Restart", "RootImage",
+                              "NotifyAccess"))
                 r = sd_bus_message_append(m, "v", "s", eq);
 
         else if (streq(field, "SyslogLevel")) {
@@ -389,6 +390,15 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
 
                 r = sd_bus_message_append(m, "v", "i", (int32_t) n);
 
+        } else if (streq(field, "FileDescriptorStoreMax")) {
+                unsigned u;
+
+                r = safe_atou(eq, &u);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse file descriptor store limit: %s", eq);
+
+                r = sd_bus_message_append(m, "v", "u", (uint32_t) u);
+
         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
                 const char *p;