Force test validator to take into account stderr exclusions

This is needed to take into account a new Info message from ROOT 6.26 (LCG 102).

Ideally we could suppress the message by changing the message suppression level in ROOT, but it requires further discussion.

added lhcb-head-2 label

added RTA label

• [2023-01-18 00:03] Validation started with lhcb-head-2#757
• [2023-01-19 00:03] Validation started with lhcb-head-2#758
• [2023-01-19 11:28] Validation started with lhcb-head-2#759
• [2023-01-20 00:03] Validation started with lhcb-head-2#760
• [2023-01-20 09:28] Validation started with lhcb-master-mr#6756
• [2023-01-20 13:24] Validation started with lhcb-head-2#761
• [2023-01-20 22:53] Validation started with lhcb-master-mr#6768
• [2023-01-21 00:11] Validation started with lhcb-head-2#762
• [2023-01-23 00:03] Validation started with lhcb-head-2#763

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• d3590d56 - Force test validator to take into account stderr exclusions

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mentioned in merge request Allen!1103 (merged)

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mentioned in merge request Rec!3278 (merged)

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/ci-test

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/ci-test

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mentioned in commit 53ad123a