Storage: store uploaded files in SQL rather than on the disk (#49034)

* #48259: set up storages per org id

* #48259: migrate to storage_sql

pkg/services/store/storage_sql_test.go

@@ -0,0 +1,27 @@
+package store
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetDbStoragePathPrefix(t *testing.T) {
+	tests := []struct {
+		orgId       int64
+		storageName string
+		expected    string
+	}{
+		{
+			orgId:       124,
+			storageName: "long-storage-name",
+			expected:    "/124/long-storage-name/",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(fmt.Sprintf("orgId: %d, storageName: %s", tt.orgId, tt.storageName), func(t *testing.T) {
+			assert.Equal(t, tt.expected, getDbStoragePathPrefix(tt.orgId, tt.storageName))
+		})
+	}
+}