chore: add comments for "api/healthz", clean up test env (#36481)

GITEA_UNIT_TESTS_LOG_SQL is renamed to GITEA_TEST_LOG_SQL

modules/gitrepo/main_test.go

@@ -8,12 +8,12 @@ import (
 	"testing"
 
 	"code.gitea.io/gitea/modules/git"
-	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/modules/setting"
 )
 
 func TestMain(m *testing.M) {
 	// resolve repository path relative to the test directory
-	testRootDir := test.SetupGiteaRoot()
+	testRootDir := setting.SetupGiteaTestEnv()
 	repoPath = func(repo Repository) string {
 		if filepath.IsAbs(repo.RelativePath()) {
 			return repo.RelativePath() // for testing purpose only