[DBAAS-7152] | Added config for mysql incremental backup part (#1089)

* Added config for mysql incremental backup part

* Refactoring

Author: shivamp296

specification/resources/databases/models/advanced_config/mysql_advanced_config.yml

@@ -265,3 +265,12 @@ properties:
       - NONE
     example: INSIGHTS
     default: NONE
+  mysql_incremental_backup.enabled:
+    description: >-
+      Enable periodic incremental backups. When enabled, full_backup_week_schedule must be set. Incremental backups only store changes since the last backup, making them faster and more storage-efficient than full backups. This is particularly useful for large databases where daily full backups would be too time-consuming or expensive.
+    type: boolean
+  mysql_incremental_backup.full_backup_week_schedule:
+    description: >-
+      Comma-separated list of days of the week when full backups should be created. Valid values: mon, tue, wed, thu, fri, sat, sun. Default is null. Example : "mon,fri,sun". 
+    type: string
+    example: mon,thu