Fix flaky search form test

The test tries to create a vaccination record with a different programme
to that currently being search across, however because the vaccination
record factory picks programmes at random it's possible that sometimes
the two programmes will match. There's a unique index on the type of
programme meaning when two programmes of the same type are created we
get a unique constraint failure.

Author: thomasleese

spec/forms/search_form_spec.rb

@@ -544,7 +544,8 @@
         create(
           :vaccination_record,
           patient:,
-          performed_ods_code: organisation.ods_code
+          performed_ods_code: organisation.ods_code,
+          programme: create(:programme, :hpv)
         )
       end