Distinguish BEAAM appeals (#16853)

Resolves goal 2 of option 1 in the [Tech Spec](#16508)
> 2. Enable application code to identify BEAAM appeals.

### Description
Enables application code to identify BEAAM appeals.

### Acceptance Criteria
- [ ] Code compiles correctly
- [ ] `appeal.beaam?` returns `true` for all BEAAM appeals in Caseflow prod environment

app/models/appeal.rb

@@ -8,6 +8,7 @@
 # rubocop:disable Metrics/ClassLength
 class Appeal < DecisionReview
   include AppealConcern
+  include BeaamAppealConcern
   include BgsService
   include Taskable
   include PrintsTaskTree

app/models/concerns/beaam_appeal_concern.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# This concern is used to identify appeals associated with the BEAAM program.
+# Fulfills goal 2 of option 1 in the Tech Spec: Enable application code to identify BEAAM appeals.
+# See https://github.com/department-of-veterans-affairs/caseflow/wiki/BEAAM-Appeals
+# and Tech Spec https://github.com/department-of-veterans-affairs/caseflow/issues/16508
+module BeaamAppealConcern
+  extend ActiveSupport::Concern
+
+  # Copied from https://github.com/department-of-veterans-affairs/caseflow/pull/8733/files
+  BEAAM_CASE_IDS = [25, 26, 27, 28, 29, 30, 31, 32, 33, 34,
+                    36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
+                    50, 51,
+                    53].freeze
+
+  def beaam?
+    BEAAM_CASE_IDS.include?(id) && Rails.env.production?
+  end
+end

spec/models/concerns/beaam_appeal_concern_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+describe BeaamAppealConcern do
+  describe "#beaam?" do
+    before { allow(Rails.env).to receive(:production?).and_return(true) }
+
+    let(:appeal) { create(:appeal, id: 1) }
+    subject { appeal.beaam? }
+    context "non-BEAAM appeal" do
+      it { is_expected.to eq false }
+    end
+    context "BEAAM appeal" do
+      let(:appeal) { create(:appeal, id: BeaamAppealConcern::BEAAM_CASE_IDS.sample) }
+      it { is_expected.to eq true }
+    end
+  end
+end