docs: remove review timeline from task template
Description
We almost never use this section, so it just adds noise to tickets.
If a specific timeline is really needed, then this should be mentioned in the ticket and/or the "Due Date" field used.
Supporting information
Private-ref: https://tasks.opencraft.com/browse/BB-3149
Previously raised at https://forum.opencraft.com/t/feedback-following-processes/1997/5
Testing instructions
- verify the changes render as expected
- verify that it's fine to remove this field
Edited by Samuel Allan