Hackaton: Add more unit tests, take 4 (#101704)

* cloudmigration/cloudmigrationimpl: run integration tests in parallel

* tsdb/mysql: run tests with actual service and instance manager

* pluginsintegration/angulardetectorsprovider: reduce job interval in test

* util: extract test that should only be ran with -race enabled and unskip it

pkg/util/shortid_generator_race_test.go

@@ -0,0 +1,25 @@
+//go:build race
+// +build race
+
+package util
+
+import (
+	"sync"
+	"testing"
+)
+
+// Run with "go test -race -run ^TestThreadSafe$ github.com/grafana/grafana/pkg/util"
+func TestThreadSafe(t *testing.T) {
+	// Use 1000 go routines to create 100 UIDs each at roughly the same time.
+	var wg sync.WaitGroup
+	for i := 0; i < 1000; i++ {
+		go func() {
+			for ii := 0; ii < 100; ii++ {
+				_ = GenerateShortUID()
+			}
+			wg.Done()
+		}()
+		wg.Add(1)
+	}
+	wg.Wait()
+}