fix(db): add additional connection pool for projection spooling (#7094)

* fix(db): add additional connection pool for projection spooling

* use correct connection pool for projections

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

(cherry picked from commit fe1337536f)

internal/database/dialect/config_test.go

@@ -0,0 +1,36 @@
+package dialect
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDBPurpose_AppName(t *testing.T) {
+	tests := []struct {
+		p    DBPurpose
+		want string
+	}{
+		{
+			p:    DBPurposeQuery,
+			want: QueryAppName,
+		},
+		{
+			p:    DBPurposeEventPusher,
+			want: EventstorePusherAppName,
+		},
+		{
+			p:    DBPurposeProjectionSpooler,
+			want: ProjectionSpoolerAppName,
+		},
+		{
+			p:    99,
+			want: defaultAppName,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.want, func(t *testing.T) {
+			assert.Equal(t, tt.want, tt.p.AppName())
+		})
+	}
+}