Update Lecture-Recording relationship and add Lecture cancellation status

The commit introduces notable changes to the Lecture-Recording model relationship in our application and adds a new cancellation status to Lecture model.

Models Lecture and Recording previously had a belongs_to :recording and belongs_to :lecture relationship respectively. However, this setup was not reflecting the correct relationship between these two entities in the actual educational setup where a lecture can have a recording but a recording is always of a lecture. Thus, the relationship has been revised to has_one :recording in Lecture and belongs_to :lecture in Recording models.

Also, added the ability to mark a lecture as "cancelled". This addresses the requirement of representing real-world scenarios where lectures are sometimes cancelled. This cancellation status is then reflected in the Attendance Tracker view and is also handled in the ScrapePanoptoJob.

Additionally, new changes are reflected in the application's schema, migration files, admin dashboard, and stylesheets (for displaying cancelled lectures).

app/dashboards/lecture_dashboard.rb

@@ -12,9 +12,10 @@ class LectureDashboard < Administrate::BaseDashboard
     attendance: Field::HasOne,
     course: Field::BelongsTo,
     event_uuid: Field::String,
-    recording: Field::BelongsTo,
+    recording: Field::HasOne,
     start_time: Field::DateTime,
     title: Field::String,
+    cancelled: Field::Boolean,
     created_at: Field::DateTime,
     updated_at: Field::DateTime,
   }.freeze
@@ -27,6 +28,7 @@ class LectureDashboard < Administrate::BaseDashboard
   COLLECTION_ATTRIBUTES = %i[
     title
     course
+    cancelled
     start_time
     recording
   ].freeze
@@ -37,6 +39,7 @@ class LectureDashboard < Administrate::BaseDashboard
     id
     attendance
     course
+    cancelled
     event_uuid
     recording
     start_time
@@ -51,6 +54,7 @@ class LectureDashboard < Administrate::BaseDashboard
   FORM_ATTRIBUTES = %i[
     attendance
     course
+    cancelled
     event_uuid
     recording
     start_time

app/dashboards/recording_dashboard.rb

@@ -10,6 +10,7 @@ class RecordingDashboard < Administrate::BaseDashboard
   ATTRIBUTE_TYPES = {
     id: Field::Number,
     course: Field::BelongsTo,
+    lecture: Field::BelongsTo,
     recording_uuid: Field::String,
     start_time: Field::DateTime,
     title: Field::String,