Boards data retention (#19262)

* add Boards to DataRetention, add hook for data retention

* remove replaces

* update hook to remove parameter

* add boards data retention to telemetry

* fix unit test

* update test, update hooks

* update RunDataRetention server version

* put behind a feature flag

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

plugin/plugintest/hooks.go

@@ -219,6 +219,27 @@ func (_m *Hooks) ReactionHasBeenRemoved(c *plugin.Context, reaction *model.React
 	_m.Called(c, reaction)
 }
 
+// RunDataRetention provides a mock function with given fields: nowTime, batchSize
+func (_m *Hooks) RunDataRetention(nowTime int64, batchSize int64) (int64, error) {
+	ret := _m.Called(nowTime, batchSize)
+
+	var r0 int64
+	if rf, ok := ret.Get(0).(func(int64, int64) int64); ok {
+		r0 = rf(nowTime, batchSize)
+	} else {
+		r0 = ret.Get(0).(int64)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(int64, int64) error); ok {
+		r1 = rf(nowTime, batchSize)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // ServeHTTP provides a mock function with given fields: c, w, r
 func (_m *Hooks) ServeHTTP(c *plugin.Context, w http.ResponseWriter, r *http.Request) {
 	_m.Called(c, w, r)