Add support for sending raw (non-encoded) attachments in Resend mail #55837
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(This is the same PR as #55803, but then for V11.)
This PR adds support for sending raw (non-base64 encoded) attachments in the Resend mail driver, which is useful for cases like sending .ics (calendar) files.
The Resend API currently does not properly handle base64-encoded .ics attachments. As a workaround, this PR allows certain attachments (e.g., with the text/calendar MIME type) to be sent as raw content without encoding.
Changes
Introduces conditional logic in ResendTransport to skip encoding when the attachment has a media type of text/calendar
Why this is needed