activate isolate mode to calculate gas usage correctly

Author: alex0207s

foundry.toml

@@ -6,6 +6,7 @@ solc_version = "0.8.17"
 optimizer = true # enable or disable the solc optimizer
 optimizer_runs = 1000 # the number of optimizer runs
 verbosity = 3 # The verbosity of tests
+isolate = true # enable or disable the isolate mode for calculating gas usage correctly
 fs_permissions = [
     { access = "read", path = "./test/utils/config/" },
     { access = "read", path = "./test/utils/payload/" },