Chore: Update test database initialization (#81673)

* streamline initialization of test databases, support on-disk sqlite test db

* clean up test databases

* introduce testsuite helper

* use testsuite everywhere we use a test db

* update documentation

* improve error handling

* disable entity integration test until we can figure out locking error

pkg/services/sqlstore/sqlstore_test.go

@@ -2,6 +2,7 @@ package sqlstore
 
 import (
 	"context"
+	"os"
 	"testing"
 	"time"
 
@@ -11,6 +12,13 @@ import (
 	"github.com/grafana/grafana/pkg/services/org"
 )
 
+func TestMain(m *testing.M) {
+	SetupTestDB()
+	code := m.Run()
+	CleanupTestDB()
+	os.Exit(code)
+}
+
 func TestIntegrationIsUniqueConstraintViolation(t *testing.T) {
 	store := InitTestDB(t)