MuIdTrackBuilder downgrade WARNING message if fit improvements fail

Johannes Junggeburthrequested to merge
(removed):ATLASRECTS-6002 into master

Hi,

if muon tracks have poor quality, several attempts are made by the MuIdTrackBuilder to improve the quality. If all fail, the track is discarded and the warning message is printed. These failures can happen and hence the message is downgraded to DEBUG.

Adding @wleight

Closes ATLASRECTS-6002

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