[Refactor] `nvm run`/`nvm exec`: use `NVM_SILENT` consistently internally
[Refactor] `nvm run`/`nvm exec`: use `NVM_SILENT` consistently internally

ljharb/nvm,creationix/nvm,PeterDaveHello/nvm,ljharb/nvm,PeterDaveHello/nvm,creationix/nvm