"Commitment" is countable because someone can have multiple commitments. Here the commitment is to quality, but another commitment could be to profitability. "Quality" is fine here. You could make it more specific if you wanted to: product quality, service quality, etc.

It means senior managers show(demonstrate) a loyality or dedication(commitment) for best/good products or work (quality) undoubtly means without a doubt or certainly or for sure

Oh, thank you, Amul.

This is what is known as Management Waffle - it actually conveys very little information but tries to sound impressive about it. What it means is that Senior Managers will not deliver services/goods of inferior quality. But then you would not really want to deal with any management which was committed to delivering poor quality products!