Move post-commit operations -> ImmunisationImport#post_commit!

The name of this method suggests it's purpose is to execute code against the
data committed by the transaction in `ImmunisationImport#process!`. It wasn't
obvious to us why some operations were inside this method and some were not.
This commit moves all the code after the transaction into
`ImmunisationImport#post_commit!`.

Co-authored-by: Chris Lowis <chris.lowis@gofreerange.com>

Author: floehopper

app/models/immunisation_import.rb

@@ -89,9 +89,6 @@ def process!
     end
 
     post_commit!
-    UpdatePatientsFromPDS.call(patients, queue: :imports)
-
-    TeamCachedCounts.new(team).reset_import_issues!
   end
 
   private
@@ -227,5 +224,9 @@ def post_commit!
       .find_each do |vaccination_record|
         AlreadyHadNotificationSender.call(vaccination_record:)
       end
+
+    UpdatePatientsFromPDS.call(patients, queue: :imports)
+
+    TeamCachedCounts.new(team).reset_import_issues!
   end
 end