Revert "Retry cURL downloads (#50731)" (#51466)

This reverts commit 492fb6381ef589fc36e0371ad3af87cc689c4926.

Reason for revert: Dart HHH infrastructure including Golem builders are using older images which have older curl which does not support these flags. Upgrading images takes long time - so in the interim we are forced to revert to avoid accumulating gap in coverage.