v1.18: blockstore: store first received coding shred index in ErasureMeta (backport of #961)#981

AshwinSekar merged 2 commits intov1.18anza-xyz/agave:v1.18from

mergify/bp/v1.18/pr-961anza-xyz/agave:mergify/bp/v1.18/pr-961Copy head branch name to clipboard