## Description
Support for `itemAttachment.Mail` added to GC restore pipeline.
Nested attachments within items disabled due to Kiota bug.
Issue #2428 created to re-enable `itemAttachment.Item.Attachments` when the bug is patched.
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## Does this PR need a docs update or release note?
- [x] 🏢 : Yes. Known issues and ChangeLog updates required.
## Type of change
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- [x] 🌻 Feature
- [x] 🐛 Bugfix
## Issue(s)
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* related to https://github.com/microsoft/kiota-serialization-json-go/issues/61<issue>
* closes#2372
## Test Plan
- [x] ⚡ Unit test
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