[MM-14720] Add Posts Per Day Analytics and Number Posts Previous Day Functionality (#11402)

* Add ability to get bot counts per day

Modify tests using AnalyticsPostCountsByDay to include extra input
(botsOnly)

Correctly generate the mock file with 'make store-mocks' target.  Didn't
see these comments earlier

* Initial commit for calculating total posts previous day and total posts
from bots previous day

* - Refactor to use asserts instead of if statements in tests
- Capture inputs to AnalyticsPostCountsByDay() function into an
  options struct
- Remove bot creation from diagnostics_test.go.

* Remove utils library

* create AnalyticsPostCountsOptions struct which is accepted as an input
to AnalyticsPostCountsByDay method

* Go vet fixes

app/analytics.go

@@ -181,13 +181,26 @@ func (a *App) GetAnalytics(name string, teamId string) (model.AnalyticsRows, *mo
 		rows[9].Value = float64(r.Data.(int64))
 
 		return rows, nil
+	} else if name == "bot_post_counts_day" {
+		if skipIntensiveQueries {
+			rows := model.AnalyticsRows{&model.AnalyticsRow{Name: "", Value: -1}}
+			return rows, nil
+		}
+		return a.Srv.Store.Post().AnalyticsPostCountsByDay(&model.AnalyticsPostCountsOptions{
+			TeamId:        teamId,
+			BotsOnly:      true,
+			YesterdayOnly: false,
+		})
 	} else if name == "post_counts_day" {
 		if skipIntensiveQueries {
 			rows := model.AnalyticsRows{&model.AnalyticsRow{Name: "", Value: -1}}
 			return rows, nil
 		}
-
-		return a.Srv.Store.Post().AnalyticsPostCountsByDay(teamId)
+		return a.Srv.Store.Post().AnalyticsPostCountsByDay(&model.AnalyticsPostCountsOptions{
+			TeamId:        teamId,
+			BotsOnly:      false,
+			YesterdayOnly: false,
+		})
 	} else if name == "user_counts_with_posts_day" {
 		if skipIntensiveQueries {
 			rows := model.AnalyticsRows{&model.AnalyticsRow{Name: "", Value: -1}}