switching warning to debug for combMuTrackBuilder
This MR is part of a larger effort (documented at ATLASRECTS-8048) to address warning messages and downgrade them to DEBUG for the time being. In this particular case, details are described at ATLASRECTS-7522.
The warning arises from the following alg: MuonInsideOutRecoAlg.MuonInsideOutRecoTool.MuonCandidateTrackBuilderTool.CombinedMuonTrackBuilder. It seems that this particular alg, has a specific message helper, that at the end also provides summary. For the time being, I have only replaced the particular message that was mentioned in the JIRA while keeping the rest same.