Get programmes for GOV.UK Notify personalisation

At the moment, to determine the programmes (used in GOV.UK Notify
personalisation), they need to be passed in explicitly when we send the
email. This is causing an issue with the `vaccine_side_effects` variable
where it's not available for session reminders because the programmes
cannot be determined correctly.

Jira-Issue: MAV-1355

Author: thomasleese

app/lib/govuk_notify_personalisation.rb

@@ -30,6 +30,10 @@ def initialize(
         consent&.organisation || vaccination_record&.organisation
     @team = session&.team || consent_form&.team || vaccination_record&.team
     @vaccination_record = vaccination_record
+
+    if @programmes.empty? && @session.present? && @patient.present?
+      @programmes = @session.eligible_programmes_for(patient: @patient)
+    end
   end
 
   def to_h

spec/lib/govuk_notify_personalisation_spec.rb

@@ -1,15 +1,17 @@
 # frozen_string_literal: true
 
 describe GovukNotifyPersonalisation do
-  subject(:to_h) do
-    described_class.new(
+  subject(:to_h) { described_class.new(**params).to_h }
+
+  let(:params) do
+    {
       patient:,
       session:,
       consent:,
       consent_form:,
       programmes:,
       vaccination_record:
-    ).to_h
+    }
   end
 
   let(:programmes) { [create(:programme, :hpv)] }
@@ -256,5 +258,20 @@
         )
       )
     end
+
+    context "when programmes comes from the session" do
+      let(:params) do
+        { patient:, session:, consent:, consent_form:, vaccination_record: }
+      end
+
+      it do
+        expect(to_h).to match(
+          hash_including(
+            vaccine_side_effects:
+              "- generally feeling unwell\n- swelling or pain where the injection was given"
+          )
+        )
+      end
+    end
   end
 end