[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>

webapp/platform/types/src/config.ts

@@ -33,8 +33,8 @@ export type ClientConfig = {
     CWSMock: string;
     DataRetentionEnableFileDeletion: string;
     DataRetentionEnableMessageDeletion: string;
-    DataRetentionFileRetentionDays: string;
-    DataRetentionMessageRetentionDays: string;
+    DataRetentionFileRetentionHours: string;
+    DataRetentionMessageRetentionHours: string;
     DefaultClientLocale: string;
     DefaultTheme: string;
     DiagnosticId: string;
@@ -828,7 +828,9 @@ export type DataRetentionSettings = {
     EnableMessageDeletion: boolean;
     EnableFileDeletion: boolean;
     MessageRetentionDays: number;
+    MessageRetentionHours: number;
     FileRetentionDays: number;
+    FileRetentionHours: number;
     DeletionJobStartTime: string;
     BatchSize: number;
     EnableBoardsDeletion: boolean,