Moving diagnostics into a service (#14832)

* Moving diagnostics into a service

* Fixing golint checks

* Fixing tests

* Renaming from diagnostics to telemetry

* Adding missing files

* Initializing telemetry earlier in the server startup

* Fixing tests

* Adding a log for the telemetryID initialization error

* Addressing PR review comments

* Fixing merge problem

* Removing some extra Diagnostics mentions

* Making tests pass

app/opentracing/opentracing_layer.go

@@ -2901,23 +2901,6 @@ func (a *OpenTracingAppLayer) DemoteUserToGuest(user *model.User) *model.AppErro
 	return resultVar0
 }
 
-func (a *OpenTracingAppLayer) DiagnosticId() string {
-	origCtx := a.ctx
-	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.DiagnosticId")
-
-	a.ctx = newCtx
-	a.app.Srv().Store.SetContext(newCtx)
-	defer func() {
-		a.app.Srv().Store.SetContext(origCtx)
-		a.ctx = origCtx
-	}()
-
-	defer span.Finish()
-	resultVar0 := a.app.DiagnosticId()
-
-	return resultVar0
-}
-
 func (a *OpenTracingAppLayer) DisableAutoResponder(userId string, asAdmin bool) *model.AppError {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.DisableAutoResponder")
@@ -13069,21 +13052,6 @@ func (a *OpenTracingAppLayer) SetDefaultProfileImage(user *model.User) *model.Ap
 	return resultVar0
 }
 
-func (a *OpenTracingAppLayer) SetDiagnosticId(id string) {
-	origCtx := a.ctx
-	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.SetDiagnosticId")
-
-	a.ctx = newCtx
-	a.app.Srv().Store.SetContext(newCtx)
-	defer func() {
-		a.app.Srv().Store.SetContext(origCtx)
-		a.ctx = origCtx
-	}()
-
-	defer span.Finish()
-	a.app.SetDiagnosticId(id)
-}
-
 func (a *OpenTracingAppLayer) SetLog(l *mlog.Logger) {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.SetLog")
@@ -13785,6 +13753,23 @@ func (a *OpenTracingAppLayer) TeamMembersToRemove(teamID *string) ([]*model.Team
 	return resultVar0, resultVar1
 }
 
+func (a *OpenTracingAppLayer) TelemetryId() string {
+	origCtx := a.ctx
+	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.TelemetryId")
+
+	a.ctx = newCtx
+	a.app.Srv().Store.SetContext(newCtx)
+	defer func() {
+		a.app.Srv().Store.SetContext(origCtx)
+		a.ctx = origCtx
+	}()
+
+	defer span.Finish()
+	resultVar0 := a.app.TelemetryId()
+
+	return resultVar0
+}
+
 func (a *OpenTracingAppLayer) TestElasticsearch(cfg *model.Config) *model.AppError {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.TestElasticsearch")