[9.18] Add a friendly Danger plea to run the pairwise CI job
Sometimes a pairwise definition for a new ./configure switch is added but not tested in the CI.
(cherry picked from commit 96563c60)
Backport of MR !7876 (merged)
Sometimes a pairwise definition for a new ./configure switch is added but not tested in the CI.
(cherry picked from commit 96563c60)
Backport of MR !7876 (merged)