Bug 30222: Only send auto renewal digest wehn there is an update

Bug 30222: Only send auto renewal digest wehn there is an update

Currently, the code sends an email to the patron when there is any error that is not
'too_soon' - we also don't include issues that are 'too_soon', so emials may be missing information

This patch changes the code to:
1 - push all issues that were checked to the report when a borrower wants a digest
2 - adds a variable to track when any of the issues has been updated, and checkes this when
    sending digests
3 - if nothing has been updated, no report is sent to the patron

To test:
 1 - Checkout an item, marked for autorenewal, backdated to be overdue to a patron
 2 - Set preferences
    AutoRenewalNotices = 'according to patron messaging preferences'
    EnhancedMessagingPreferences = 'Allow'
 3 - Set the patrons preference for auto renewal to email+digest
 4 - Ensure the patron has an email
 5 - Place an item level hold for another patron on the issued item
 6 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
 7 - Check patron record/notices tab
 8 - Note item not renewed, patron notified
 9 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
10 - Note item not renewed, status not changed, patron notified again
11 - Apply patch
12 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
13 - Item not renewed, patron no notified
14 - Checkout another item marked for auto renewal to the patron, but due in the future
     ensure it is outside of 'no renewal before'
15 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
16 - Patron not notified, items not renewd
     Change to status of 'auto_too_soon' is not notified
17 - Checkout a third item, marked for auto renew, overdue
18 - place an item level hold for another patorn on third item
19 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
20 - patron is notified, nothing renewed, all statuses reported
21 - cancel the item level hold on third item
22 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
23 - item renewed, patron notified, all statuses reported
24 - perl misc/cronjobs/automatic_renewals.pl -v --confirm
25 - nothing renewed, patron not notified, only change is one issue 'auto_too_soon'

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>