Source notify log entry purpose from the template, not a dispatcher

Delivery jobs now record `purpose: template.purpose` when creating a
NotifyLogEntry. NotifyLogEntry.purpose_for_template_name and its
spec go away.

Jira-Issue: MAV-6739

Author: benilovj

app/jobs/email_delivery_job.rb

@@ -103,7 +103,7 @@ def perform(
       subject: rendered[:subject],
       template_id: template.id,
       type: :email,
-      purpose: NotifyLogEntry.purpose_for_template_name(template_name_sym),
+      purpose: template.purpose,
       notify_log_entry_programmes_attributes:
         personalisation.programmes.map do
           { programme_type: it.type, disease_types: it.disease_types }

app/jobs/sms_delivery_job.rb

@@ -93,7 +93,7 @@ def perform(
       sent_by:,
       template_id: template.id,
       type: :sms,
-      purpose: NotifyLogEntry.purpose_for_template_name(template_name_sym),
+      purpose: template.purpose,
       notify_log_entry_programmes_attributes:
         personalisation.programmes.map do
           { programme_type: it.type, disease_types: it.disease_types }

app/models/notify_log_entry.rb

@@ -159,40 +159,6 @@ def title
 
   def programmes = notify_log_entry_programmes.map(&:programme)
 
-  def self.purpose_for_template_name(template_name_sym)
-    name = template_name_sym.to_s
-
-    if name.include?("consent") && name.include?("request")
-      :consent_request
-    elsif name.include?("consent") && name.include?("reminder")
-      :consent_reminder
-    elsif name.include?("consent_confirmation")
-      :consent_confirmation
-    elsif name.include?("consent") && name.include?("warning")
-      :consent_warning
-    elsif name.include?("clinic") && name.include?("invitation")
-      :clinic_invitation
-    elsif name.include?("session_school_reminder")
-      :session_reminder
-    elsif name.include?("triage_vaccination_will_happen")
-      :triage_vaccination_will_happen
-    elsif name.include?("triage_vaccination_wont_happen")
-      :triage_vaccination_wont_happen
-    elsif name.include?("triage_vaccination_at_clinic")
-      :triage_vaccination_at_clinic
-    elsif name.include?("triage_delay_vaccination")
-      :triage_delay_vaccination
-    elsif name.include?("vaccination_administered")
-      :vaccination_administered
-    elsif name.include?("vaccination_already_had")
-      :vaccination_already_had
-    elsif name.include?("vaccination_not_administered")
-      :vaccination_not_administered
-    elsif name.include?("vaccination_deleted")
-      :vaccination_deleted
-    end
-  end
-
   private
 
   def template_name

spec/models/notify_log_entry_spec.rb

@@ -51,102 +51,6 @@
     it { should be_valid }
   end
 
-  describe ".purpose_for_template_name" do
-    subject(:purpose) do
-      described_class.purpose_for_template_name(template_name)
-    end
-
-    context "when the template indicates a consent request" do
-      let(:template_name) { :consent_school_request }
-
-      it { should eq(:consent_request) }
-    end
-
-    context "when the template indicates a consent reminder" do
-      let(:template_name) { :consent_school_reminder }
-
-      it { should eq(:consent_reminder) }
-    end
-
-    context "when the template indicates a consent confirmation" do
-      let(:template_name) { :consent_confirmation_given }
-
-      it { should eq(:consent_confirmation) }
-    end
-
-    context "when the template indicates a consent warning" do
-      let(:template_name) { :consent_unknown_contact_details_warning }
-
-      it { should eq(:consent_warning) }
-    end
-
-    context "when the template indicates a clinic invitation" do
-      let(:template_name) { :clinic_flu_invitation }
-
-      it { should eq(:clinic_invitation) }
-    end
-
-    context "when the template indicates a session reminder" do
-      let(:template_name) { :session_school_reminder_today }
-
-      it { should eq(:session_reminder) }
-    end
-
-    context "when the template indicates triage vaccination will happen" do
-      let(:template_name) { :triage_vaccination_will_happen_outcome }
-
-      it { should eq(:triage_vaccination_will_happen) }
-    end
-
-    context "when the template indicates triage vaccination won't happen" do
-      let(:template_name) { :triage_vaccination_wont_happen_outcome }
-
-      it { should eq(:triage_vaccination_wont_happen) }
-    end
-
-    context "when the template indicates triage vaccination at clinic" do
-      let(:template_name) { :triage_vaccination_at_clinic_outcome }
-
-      it { should eq(:triage_vaccination_at_clinic) }
-    end
-
-    context "when the template indicates a triage delay vaccination update" do
-      let(:template_name) { :triage_delay_vaccination_outcome }
-
-      it { should eq(:triage_delay_vaccination) }
-    end
-
-    context "when the template indicates vaccination administered" do
-      let(:template_name) { :vaccination_administered_notification }
-
-      it { should eq(:vaccination_administered) }
-    end
-
-    context "when the template indicates vaccination already had" do
-      let(:template_name) { :vaccination_already_had_notification }
-
-      it { should eq(:vaccination_already_had) }
-    end
-
-    context "when the template indicates vaccination not administered" do
-      let(:template_name) { :vaccination_not_administered_notification }
-
-      it { should eq(:vaccination_not_administered) }
-    end
-
-    context "when the template indicates vaccination deleted" do
-      let(:template_name) { :vaccination_deleted_notification }
-
-      it { should eq(:vaccination_deleted) }
-    end
-
-    context "when the template name does not match any known purpose" do
-      let(:template_name) { :something_else_entirely }
-
-      it { should be_nil }
-    end
-  end
-
   describe "#title" do
     subject(:title) { notify_log_entry.title }