[Maintenance Windows] Support requiresDowntime in module-config

[lindnerby]

Description

To support the introduced flag requiresDowntime of ModuleTemplate in kyma-project/lifecycle-manager#2100, we need to extend modulectl's create and scaffold commands. Module teams should be able to set this flag in in the config-file for the create command and the scaffold output should scaffold this field as a comment as well.

Reasons

We need to harmonize Kyma related upgrade windows with BTP defined major update windows, so that if module upgrades require downtimes, the upgrade is scheduled within the BTP major upgrade window for the given region and plan.

Because of that we introduce the support of .spec.requiresDowntime with kyma-project/lifecycle-manager#2099. modulectl should also support template creation with this flag initialized by module teams.

Acceptance Criteria

• Added support for field requiresDowntime in module config-file for create command
• Added scaffolded field requiresDowntime as comment in module config-file output of scaffold command

Related issue

• Support maintenance window for module upgrades kyma#18611