Run respdiff also for scheduled and web pipelines

Run respdiff also for scheduled and web pipelines

respdiff needs to be run regularly to identify problems with query
responses discrepancies sooner than after tagging a release.

Contrary to the main branch, which hosts the BIND 9 Development Version
and thus sets MAX_DISAGREEMENTS_PERCENTAGE variable to 0.5, branches
hosting BIND 9 Stable Versions have it set to 0.1, which provides only
tiny room for non-timeout response disagreements between the baseline
version and version under test.

(cherry picked from commit 561b58196bfe75fbbea4598b214afd7fffe2b537)