Fix failing test DynamicTableHelper

[kdp-cloud]

This tests fails often randomly:

DynamicTableHelperTest#test_Should_return_the_dynamic_table_columns_and_rows [/home/runner/work/seek/seek/test/unit/helpers/dynamic_table_helper_test.rb:51]
Minitest::Assertion: Expected: false
  Actual: true

The issue is probably the usage of the ISA tag fixtures. It would be best to replace them with factories instead.