MM-50347 Make desktop app landing page optional (#28421)

* fix: Make desktop app landing page optional

* Update i18n strings

* Fix linting and unit test

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Co-authored-by: Kiran <kiran@krinati.co>

server/config/client.go

@@ -25,6 +25,7 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 	props["EnableJoinLeaveMessageByDefault"] = strconv.FormatBool(*c.TeamSettings.EnableJoinLeaveMessageByDefault)
 
 	props["EnableBotAccountCreation"] = strconv.FormatBool(*c.ServiceSettings.EnableBotAccountCreation)
+	props["EnableDesktopLandingPage"] = strconv.FormatBool(*c.ServiceSettings.EnableDesktopLandingPage)
 	props["EnableOAuthServiceProvider"] = strconv.FormatBool(*c.ServiceSettings.EnableOAuthServiceProvider)
 	props["GoogleDeveloperKey"] = *c.ServiceSettings.GoogleDeveloperKey
 	props["EnableIncomingWebhooks"] = strconv.FormatBool(*c.ServiceSettings.EnableIncomingWebhooks)
@@ -244,6 +245,7 @@ func GenerateLimitedClientConfig(c *model.Config, telemetryID string, license *m
 	props["ServiceEnvironment"] = model.GetServiceEnvironment()
 
 	props["EnableBotAccountCreation"] = strconv.FormatBool(*c.ServiceSettings.EnableBotAccountCreation)
+	props["EnableDesktopLandingPage"] = strconv.FormatBool(*c.ServiceSettings.EnableDesktopLandingPage)
 	props["EnableFile"] = strconv.FormatBool(*c.LogSettings.EnableFile)
 	props["FileLevel"] = *c.LogSettings.FileLevel