MM-32693: Use master when emoji_layer is invalidated (#16951)

We add a map which tracks invalidations to the emoji caches
and use master whenever a fresh item is fetched from DB.

https://mattermost.atlassian.net/browse/MM-32693

```release-note
NONE
```

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

store/timerlayer/timerlayer.go

@@ -2575,10 +2575,10 @@ func (s *TimerLayerEmojiStore) Delete(emoji *model.Emoji, time int64) error {
 	return err
 }
 
-func (s *TimerLayerEmojiStore) Get(id string, allowFromCache bool) (*model.Emoji, error) {
+func (s *TimerLayerEmojiStore) Get(ctx context.Context, id string, allowFromCache bool) (*model.Emoji, error) {
 	start := timemodule.Now()
 
-	result, err := s.EmojiStore.Get(id, allowFromCache)
+	result, err := s.EmojiStore.Get(ctx, id, allowFromCache)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -2591,10 +2591,10 @@ func (s *TimerLayerEmojiStore) Get(id string, allowFromCache bool) (*model.Emoji
 	return result, err
 }
 
-func (s *TimerLayerEmojiStore) GetByName(name string, allowFromCache bool) (*model.Emoji, error) {
+func (s *TimerLayerEmojiStore) GetByName(ctx context.Context, name string, allowFromCache bool) (*model.Emoji, error) {
 	start := timemodule.Now()
 
-	result, err := s.EmojiStore.GetByName(name, allowFromCache)
+	result, err := s.EmojiStore.GetByName(ctx, name, allowFromCache)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {