Removed post limit warning banner (#27036)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/limits.go

@@ -7,7 +7,4 @@ type ServerLimits struct {
 	MaxUsersLimit     int64 `json:"maxUsersLimit"`     // soft limit for max number of users.
 	MaxUsersHardLimit int64 `json:"maxUsersHardLimit"` // hard limit for max number of active users.
 	ActiveUserCount   int64 `json:"activeUserCount"`   // actual number of active users on server. Active = non deleted
-
-	MaxPostLimit int64 `json:"maxPostLimit"` // soft limit for max number of posts
-	PostCount    int64 `json:"postCount"`    // actual number of posts in system.
 }