Update policy on sanity tests failures

The sanity manual test is the first test run to confirm the health of the
image. For this reason, the test itself states that no other manual test
should run if there is a failure.

This policy aims to avoid running tests on an image which is not healthy
enough since the results will not be valid. This policy is too strict,
since due to failure in one are, like WiFi, will block the rest of the
tests.

To provide a better trade off, update the policy to avoid running other
manual tests until the issue is triaged.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

test-cases/sanity-check-manual.yaml

@@ -54,7 +54,7 @@ metadata:
 
   notes:
     - "IMPORTANT: If this test fails for an image, NO further tests should be
-       executed on that image, since this invalidates all test results."
+       executed on that image until the issue is triaged, since this invalidates all test results."
     - "This test must be executed in an image before running either automated or
        manual tests."