Remove domains that belong to an organisation

If a domain is already in our organisation list then we no longer need
to manually update it here. As part of this process I went and
proactively added some organisations, so I could remove more of them
from this file. I only did this where I could clearly determine from the
domain or a suppot ticket what the organisation was.

app/email_domains.yml

@@ -3,59 +3,19 @@
 - mod.uk
 - mil.uk
 - ddc-mod.org
-- slc.co.uk
 - gov.scot
 - parliament.scot
 - parliament.uk
 - nhs.uk
 - nhs.net
 - police.uk
-- dclgdatamart.co.uk
-- ucds.email
-- naturalengland.org.uk
-- hmcts.net
 - scotent.co.uk
 - assembly.wales
 - cjsm.net
-- cqc.org.uk
-- bl.uk
-- stfc.ac.uk
-- wmfs.net
-- bbsrc.ac.uk
-- acas.org.uk
 - gov.wales
-- biglotteryfund.org.uk
-- marinemanagement.org.uk
-- britishmuseum.org
-- derrystrabane.com
-- highwaysengland.co.uk
 - ac.uk
-- mansheadschool.co.uk
-- esfrs.org
-- tfgm.com
-- nationalgalleries.org
 - sch.uk
-- sepa.org.uk
-- lincoln.fire-uk.org
-- derrystrabane.com
-- hscni.net
-- bi.team
-- networkrail.co.uk
-- uksbs.co.uk
-- socialworkengland.org.uk 
-- careinspectorate.com
-- unitypartnership.com 
-- nao.org.uk
-- skillsforcare.org.uk
-- judicialappointments.digital
-- lewishamhomes.org.uk
-- caa.co.uk
 - onevoicewales.wales
-- cefas.co.uk
 - mtvh.co.uk
-- officeforstudents.org.uk
-- unifiedgov.co.uk
-- tfwm.org.uk
 - wmca.org.uk
 - suttonmail.org
-- sqa.org.uk

tests/app/main/test_validators.py

@@ -93,25 +93,9 @@ def _gen_mock_field(x):
     'test@police.uk',
     'test@gov.police.uk',
     'test@GOV.PoliCe.uk',
-    'test@ucds.email',
-    'test@naturalengland.org.uk',
-    'test@hmcts.net',
     'test@scotent.co.uk',
     'test@assembly.wales',
     'test@cjsm.net',
-    'test@cqc.org.uk',
-    'test@digital.cqc.org.uk',
-    'test@bl.uk',
-    'test@stfc.ac.uk',
-    'test@wmfs.net',
-    'test@bbsrc.ac.uk',
-    'test@acas.org.uk',
-    'test@biglotteryfund.org.uk',
-    'test@marinemanagement.org.uk',
-    'test@britishmuseum.org',
-    'test@derrystrabane.com',
-    'test@highwaysengland.co.uk',
-    'test@mansheadschool.co.uk',
 ])
 def test_valid_list_of_white_list_email_domains(
     client,