Made several improvements to the `InsuranceController` to ensure a more reliable and logical handling of insured items and their attachments.
- Updates `parentAttachmentsMap` declaration to `let` for mutability, enabling dynamic updates during processing.
- Updates `parentAttachmentsMap` to initially include all attachments (including attachments that should not be in-raid moddable).
- Updates `processRegularItems` logic to include `parentAttachmentsMap` in its parameters and logic. Now better ensures that attachments are correctly identified and processed alongside their parent items.
- Adds `removeNonModdableAttachments` method to filter out non-moddable attachments from processing.
- Updates deletion logic to better handle cases where items, such as armour vests and their non-removable plates, are processed to prevent orphaned items post-deletion.
Resolves#401