Correct uniqueness error message for escalation rules

ee/app/models/incident_management/escalation_rule.rb

@@ -15,6 +15,6 @@ module IncidentManagement
               presence: true,
               numericality: { only_integer: true, greater_than_or_equal_to: 0, less_than_or_equal_to: 24.hours }
 
-    validates :policy_id, uniqueness: { scope: [:oncall_schedule_id, :status, :elapsed_time_seconds], message: _('Must have a unique policy, status, and elapsed time') }
+    validates :policy_id, uniqueness: { scope: [:oncall_schedule_id, :status, :elapsed_time_seconds], message: _('must have a unique schedule, status, and elapsed time') }
   end
 end

ee/spec/models/incident_management/escalation_rule_spec.rb

@@ -19,6 +19,6 @@ RSpec.describe IncidentManagement::EscalationRule do
     it { is_expected.to validate_presence_of(:status) }
     it { is_expected.to validate_presence_of(:elapsed_time_seconds) }
     it { is_expected.to validate_numericality_of(:elapsed_time_seconds).is_greater_than_or_equal_to(0).is_less_than_or_equal_to(24.hours) }
-    it { is_expected.to validate_uniqueness_of(:policy_id).scoped_to([:oncall_schedule_id, :status, :elapsed_time_seconds] ).with_message('Must have a unique policy, status, and elapsed time') }
+    it { is_expected.to validate_uniqueness_of(:policy_id).scoped_to([:oncall_schedule_id, :status, :elapsed_time_seconds] ).with_message('must have a unique schedule, status, and elapsed time') }
   end
 end

locale/gitlab.pot

@@ -21636,9 +21636,6 @@ msgstr ""
 msgid "Multiple uploaders found: %{uploader_types}"
 msgstr ""
 
-msgid "Must have a unique policy, status, and elapsed time"
-msgstr ""
-
 msgid "Must match with the %{codeStart}external_url%{codeEnd} in %{codeStart}/etc/gitlab/gitlab.rb%{codeEnd}."
 msgstr ""
 
@@ -39252,6 +39249,9 @@ msgstr ""
 msgid "must be greater than start date"
 msgstr ""
 
+msgid "must have a unique schedule, status, and elapsed time"
+msgstr ""
+
 msgid "my-awesome-group"
 msgstr ""