[MM-53990] Support a global retention time of less than 1 day (#25196)

* adding new MessageRetentionHours config

---------

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

server/config/client.go

@@ -122,9 +122,9 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 	props["AllowCustomThemes"] = "true"
 	props["AllowedThemes"] = ""
 	props["DataRetentionEnableMessageDeletion"] = "false"
-	props["DataRetentionMessageRetentionDays"] = "0"
+	props["DataRetentionMessageRetentionHours"] = "0"
 	props["DataRetentionEnableFileDeletion"] = "false"
-	props["DataRetentionFileRetentionDays"] = "0"
+	props["DataRetentionFileRetentionHours"] = "0"
 
 	props["CustomUrlSchemes"] = strings.Join(c.DisplaySettings.CustomURLSchemes, ",")
 	props["MaxMarkdownNodes"] = strconv.FormatInt(int64(*c.DisplaySettings.MaxMarkdownNodes), 10)
@@ -204,9 +204,9 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 
 		if *license.Features.DataRetention {
 			props["DataRetentionEnableMessageDeletion"] = strconv.FormatBool(*c.DataRetentionSettings.EnableMessageDeletion)
-			props["DataRetentionMessageRetentionDays"] = strconv.FormatInt(int64(*c.DataRetentionSettings.MessageRetentionDays), 10)
+			props["DataRetentionMessageRetentionHours"] = strconv.FormatInt(int64(c.DataRetentionSettings.GetMessageRetentionHours()), 10)
 			props["DataRetentionEnableFileDeletion"] = strconv.FormatBool(*c.DataRetentionSettings.EnableFileDeletion)
-			props["DataRetentionFileRetentionDays"] = strconv.FormatInt(int64(*c.DataRetentionSettings.FileRetentionDays), 10)
+			props["DataRetentionFileRetentionHours"] = strconv.FormatInt(int64(c.DataRetentionSettings.GetFileRetentionHours()), 10)
 		}
 
 		if license.HasSharedChannels() {