[pipeline-to-taskrun] Get ready to run presubmit tests 🏁

In #770 I tried to add the custom task and OWNERS file - with @jerop's
help I realized it would be easier to add the OWNERS file first so that
OWNERS can review the custom task itself - but even after that I was
still changing a file in the top level test dir to add the custom task
to the list of tests kicked off which needs top level OWNERS approval -
so this commit is doing that separately. Looking at the script it should
be safe to add a directory that doesn't exist because it should just get
ignored

test/presubmit-tests.sh

@@ -58,7 +58,7 @@ function should_test_folder() {
 # Get list of changed files
 initialize_environment
 
-projects="catalogs cel commit-status-tracker generators helm hub oci pipeline/cleanup pipelines-in-pipelines tekdoc task-loops notifiers/github-app cloudevents"
+projects="catalogs cel commit-status-tracker generators helm hub oci pipeline/cleanup pipelines-in-pipelines pipeline-to-taskrun tekdoc task-loops notifiers/github-app cloudevents"
 inanyprojectregex=$(echo "^${projects// /\/.* ^}\/.*" | sed 's/ /\\|/g')
 
 for proj in $projects; do