NewGraphMail -Send doesn't include attachments

[rwllr]

Because the order of how things are processed, attachments don't get included when -Send parameter is included.

[rwllr]

Using Pipeline instead to do this can work, however means the app requires additional permissions of Mail.ReadWrite as well as Mail.Send.

I think what we can do to improve things is that for attachment sizes of under 3MB refactoring New-MSGraphMailAttachment so it can return $AttachmentItem rather than uploading and then including it in a single Send API call.

https://learn.microsoft.com/en-us/graph/api/user-sendmail

[homotechsual]

So I'm going to fix this for attachment total size under 4MB - attachments over 4MB will still require ReadWrite as that workflow requires saving a draft.