fix all_host_ids reference

introduced in:
ManageIQ#20149

```
  1) EmsClusterController#show render listnav partial correctly for timeline page
     Failure/Error: sdate, edate = @tl_record.first_and_last_event(@tl_options.evt_type)

     NameError:
       undefined local variable or method `all_host_ids' for #<EmsCluster:0x000055e3fd7fb930>
       Did you mean?  all_relationship_ids
```

app/models/ems_cluster.rb

@@ -190,13 +190,13 @@ def event_where_clause(assoc = :ems_events)
     cond = ["ems_cluster_id = ?"]
     cond_params = [id]
 
-    ids = all_host_ids
+    ids = host_ids
     unless ids.empty?
       cond << "host_id IN (?) OR dest_host_id IN (?)"
       cond_params += [ids, ids]
     end
 
-    ids = all_vm_or_template_ids
+    ids = vm_or_template_ids
     unless ids.empty?
       cond << "vm_or_template_id IN (?) OR dest_vm_or_template_id IN (?)"
       cond_params += [ids, ids]

spec/models/ems_cluster_spec.rb

@@ -250,4 +250,45 @@
       end
     end
   end
+
+  describe "#event_where_clause" do
+    let(:cluster) { FactoryBot.create(:ems_cluster) }
+    # just doing one to avoid db random ordering
+    let(:vms) { FactoryBot.create_list(:vm, 1, :ems_cluster => cluster)}
+    let(:hosts) { FactoryBot.create_list(:host, 1, :ems_cluster => cluster)}
+    it "handles empty cluster" do
+      expect(cluster.event_where_clause).to eq(["ems_cluster_id = ?", cluster.id])
+    end
+
+    it "handles vms" do
+      vms # pre-load vms
+      result = cluster.event_where_clause
+      expected = [
+        "ems_cluster_id = ? OR vm_or_template_id IN (?) OR dest_vm_or_template_id IN (?)",
+        cluster.id, vms.map(&:id), vms.map(&:id)
+      ]
+      expect(result).to eq(expected)
+    end
+
+    it "handles hosts" do
+      hosts # pre-load vms
+      result = cluster.event_where_clause
+      expected = [
+        "ems_cluster_id = ? OR host_id IN (?) OR dest_host_id IN (?)",
+        cluster.id, hosts.map(&:id), hosts.map(&:id)
+      ]
+      expect(result).to eq(expected)
+    end
+
+    it "handles both" do
+      vms # pre-load vms, hosts
+      hosts
+      result = cluster.event_where_clause
+      expected = [
+        "ems_cluster_id = ? OR host_id IN (?) OR dest_host_id IN (?) OR vm_or_template_id IN (?) OR dest_vm_or_template_id IN (?)",
+        cluster.id, hosts.map(&:id), hosts.map(&:id), vms.map(&:id), vms.map(&:id)
+      ]
+      expect(result).to eq(expected)
+    end
+  end
 end