fix: invalid import and improve tests

refactor: remove initGC

test: add test for GC

fix: invalid import in z_gc

ci: test baremetal GC for coverage

ci: test baremetal GC for coverage

.github/workflows/go.yml

@@ -52,6 +52,11 @@ jobs:
         if: ${{!startsWith(matrix.os, 'macos')}}
         run: go test ./...
 
+      - name: Test Baremetal GC
+        if: ${{!startsWith(matrix.os, 'macos')}}
+        working-directory: runtime/internal/runtime/tinygogc
+        run: go test -tags testGC .
+
       - name: Test with coverage
         if: startsWith(matrix.os, 'macos')
         run: go test -coverprofile="coverage.txt" -covermode=atomic ./...