Revert "Simplify test."

This reverts commit 2310bd9.

go/ql/integration-tests/all-platforms/go/resolve-build-environment/newer-go-needed/diagnostics.expected

@@ -0,0 +1,31 @@
+{
+  "location": {
+    "file": "go.mod"
+  },
+  "markdownMessage": "As of Go 1.21, toolchain versions [must use the 1.N.P syntax](https://go.dev/doc/toolchain#version).\n\n`1.22` in `go.mod` does not match this syntax and there is no additional `toolchain` directive, which may cause some `go` commands to fail.",
+  "severity": "warning",
+  "source": {
+    "extractorName": "go",
+    "id": "go/autobuilder/invalid-go-toolchain-version",
+    "name": "Invalid Go toolchain version"
+  },
+  "visibility": {
+    "cliSummaryTable": true,
+    "statusPage": true,
+    "telemetry": true
+  }
+}
+{
+  "markdownMessage": "A single `go.mod` file was found.\n\n`go.mod`",
+  "severity": "note",
+  "source": {
+    "extractorName": "go",
+    "id": "go/autobuilder/single-root-go-mod-found",
+    "name": "A single `go.mod` file was found in the root"
+  },
+  "visibility": {
+    "cliSummaryTable": false,
+    "statusPage": false,
+    "telemetry": true
+  }
+}

go/ql/integration-tests/all-platforms/go/resolve-build-environment/newer-go-needed/test.py

@@ -1,6 +1,3 @@
-import os
-
-
-def test(check_build_environment, go):
-    # the check for resolve build-environment runs after the test and will pick up this environment variable
-    os.environ["GOTOOLCHAIN"] = "go1.21.0"
+def test(codeql, go, check_build_environment):
+    check_build_environment.env = {"GOTOOLCHAIN": "go1.21.0"}
+    codeql.database.create(source_root="src")