[datafeed] Add a raise_on_error parameter to DataFeedSource.extid2entity
And pass the option from various `process_` methods in existing parsers.
This makes debugging in tests easier.
Closes #4601191.
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile