[Invokers] mark clickon tests as long

This change aims to avoid timeouts on invoker tests that are occurring
because of the long time between clickOn calls, which can take the test
runs over the timeout threshold on some builds on slower hardware.

Bug: 40943183
Change-Id: I5976d824dd8b98355eb69991908d7b5e57937f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5372478


Reviewed-by: Joey Arhar <jarhar@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1276602}