[Maintenance Windows] Skip module upgrades during maintenance window

[lindnerby]

Depends on: #2163

Once KLM can read maintenance window policies and have them cached, it needs to respect these for modules requiring downtime. Overall, the following cases need to be covered:

• Module.RequiresDowntime: FALSE, Kyma.UseMaintenanceWindows: FALSE => module updated immediately
• Module.RequiresDowntime: TRUE, Kyma.UseMaintenanceWindows: FALSE => module updated immediately
• Module.RequiresDowntime: TRUE, Kyma.UseMaintenanceWindows: TRUE => module updated within next window, in the meantime reconciled in its currently installed version
• Module.RequiresDowntime: FALSE, Kyma.UseMaintenanceWindows: TRUE => module updated immediately

AC

• Implemented logic for above cases
• logic unit tested
• Cases E2E tested, see concept evaluation here: [Maintenance Windows] Investigate maintenance window testing approach #2164

Related issue

• Support maintenance window for module upgrades kyma#18611

[nesmabadr]

For the E2E test, we can add the maintenance windows component to the watcher_local_test Kustomization profile by using the command kustomize edit add component ../maintenance_windows from the watcher_local_test path in the workflow