This commit adds an option to change the notification settings
of a channel from default to custom in the Notifications menu
of Personal settings.
Fixes#19849.
This commit adds a variable `push_notifications_disabled` to the
checkboxes used in the notifications table in Settings > Notifications.
The variable is used to control the mobile push notifications
disabled tooltip.
Previously, the Notification triggers table in Settings lacked a
direct link to documentation for 'Followed topics'.
This commit updates the AllNotifications type to include an optional
'help_link' field and adds conditional rendering in the template to
show the help icon only if 'help_link' is present.The corresponding
test has been updated to verify the presence of the help link.
This enables direct links to relevant docs, improving usability.
Fixes: #32033.