Raise better exception on InvalidParameterValue error

There are several reasons why we might get an `InvalidParameterValue`
from the SES API. One, as correctly identified before in
https://github.com/alphagov/notifications-api/pull/713/files
is if we allow an email address on our side that SES rejects.

However, there are other types of errors that could cause an
`InvalidParameterValue`. One example is a `Header too long: 'Subject'`
error that we have seen happen in production. This shouldn't raise an
`InvalidEmailError` as that is not appropriate.

Therefore, we introduce a new exception
`EmailClientNonRetryableException`, that represents any exception back
from an email client that we can use whenever we get a
`InvalidParameterValue` error.

Note, I chose `EmailClientNonRetryableException` rather than
`SESClientNonRetryableException` as our code needs to catch this
exception and it shouldn't be aware of what email client is being used,
it just needs to know that it came from one of the email clients (if in
time we have more than one).

In time, we may wish to extend the approach of having generic
`EmailClient` exceptions and `SMSClient` exceptions as this should be
the most extendable pattern and a good abstraction.

tests/app/celery/test_provider_tasks.py

@@ -1,11 +1,11 @@
 import pytest
 from botocore.exceptions import ClientError
 from celery.exceptions import MaxRetriesExceededError
-from notifications_utils.recipients import InvalidEmailError
 
 import app
 from app.celery import provider_tasks
 from app.celery.provider_tasks import deliver_sms, deliver_email
+from app.clients.email import EmailClientNonRetryableException
 from app.clients.email.aws_ses import AwsSesClientException, AwsSesClientThrottlingSendRateException
 from app.exceptions import NotificationTechnicalFailureException
 
@@ -93,8 +93,11 @@ def test_should_go_into_technical_error_if_exceeds_retries_on_deliver_email_task
     assert sample_notification.status == 'technical-failure'
 
 
-def test_should_technical_error_and_not_retry_if_invalid_email(sample_notification, mocker):
-    mocker.patch('app.delivery.send_to_providers.send_email_to_provider', side_effect=InvalidEmailError('bad email'))
+def test_should_technical_error_and_not_retry_if_EmailClientNonRetryableException(sample_notification, mocker):
+    mocker.patch(
+        'app.delivery.send_to_providers.send_email_to_provider',
+        side_effect=EmailClientNonRetryableException('bad email')
+    )
     mocker.patch('app.celery.provider_tasks.deliver_email.retry')
 
     deliver_email(sample_notification.id)