odoo [FW][FIX] mail: prevent traceback on editing attachment of scheduled mail

Steps to reproduce

open a record from Contacts app
from chatter, click send mail , open full mail composer
add a attachment
schedule a message, by clicking '▼' on send message
Again from chatter, click on edit the same message
try to add another attachment

Observation: A traceback is received

Issue: Currently, onFileUploaded function attempts to get res_ids from data, https://github.com/odoo/odoo/blob/69828835c926485ec80ed92e14dd11fbc6c1caaa/addons/mail/static/src/core/web/mail_composer_attachment_selector.js#L25-L30

but in case message is scheduled, which is stored in mail.scheduled.message ,when editing it we do not have res_ids https://github.com/odoo/odoo/blob/69828835c926485ec80ed92e14dd11fbc6c1caaa/addons/mail/wizard/mail_compose_message.py#L120

instead we have res_id field, https://github.com/odoo/odoo/blob/69828835c926485ec80ed92e14dd11fbc6c1caaa/addons/mail/models/mail_scheduled_message.py#L46 hence a traceback is received when trying to json parse a undefined value.

Fix: Adapt the onFileUploaded function to consider both, res_ids and res_id

opw-4839926

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Forward-Port-Of: odoo/odoo#212960