Suppress some INFO messages from HLTScheduler.write test

Suppress some INFO messages from HLTScheduler.write test

See merge request !4263 (merged)

(cherry picked from commit 9b513daa)

8b2be9aa Suppress some INFO messages from HLTScheduler.write test

added all-slots label

assigned to @rmatev

• [2023-10-18 16:17] Validation started with lhcb-hlt2023-patches#4

mentioned in commit 0ab0a13d

merged