This commit changes the Codeception extension CheckSkippedTestsExtension
that we use to generate an error when tests are skipped in the `trunk` and
`release` branches. Now this extension accepts a list of tests that can
be skipped in those two branches. This will be necessary as part of the
project to support WooCommerce Custom Orders Tables as in some scenarios
we want to skip WooCommerce Subscriptions tests and in some we don't.
For now, WooCommerce Subscrptions doesn't support Woo COT, so we want to
run Woo Subscriptions tests when COT is disabled, but we want to skip
then when COT is enabled.
The main change is that now we are using the `TEST_SKIPPED` Codeception event
instead of the `SUITE_AFTER` event. This change was necessary as in the
latter event we don't have any information about the tests that were
skipped.
[MAILPOET-4695]
