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/store.go

@@ -546,8 +546,8 @@ type TokenStore interface {
 
 type EmojiStore interface {
 	Save(emoji *model.Emoji) (*model.Emoji, error)
-	Get(id string, allowFromCache bool) (*model.Emoji, error)
-	GetByName(name string, allowFromCache bool) (*model.Emoji, error)
+	Get(ctx context.Context, id string, allowFromCache bool) (*model.Emoji, error)
+	GetByName(ctx context.Context, name string, allowFromCache bool) (*model.Emoji, error)
 	GetMultipleByName(names []string) ([]*model.Emoji, error)
 	GetList(offset, limit int, sort string) ([]*model.Emoji, error)
 	Delete(emoji *model.Emoji, time int64) error