align bootstrap operation error handling

Summary:
`FB_COMMCHECKTHROW(...)` throws `runtime_error` for all other `bootstrap_` module use cases in Ctran except for this one, hence aligning this one.

Also, error handling today is inaccurate: This is a network problem instead of cuda-related failures, which is more suitable for `bad_alloc`. `CtranNvl`'s `bad_alloc` today is captured and reported by `mapper` as "NVL Backend not enabled" [link](https://www.internalfb.com/code/fbsource/[576c8cc42c2fe147a69380cc94ae483ee4581772]/fbcode/comms/ctran/mapper/CtranMapper.cc?lines=115-119), which is not the case for bootstrap related failures.

Reviewed By: saifhhasan

Differential Revision: D85985044

fbshipit-source-id: 0e9b995864f6902d50f92809f4eb683130bdd10c

Author: arttianezhu

comms/ctran/backends/nvl/CtranNvl.cc

@@ -29,8 +29,7 @@ CtranNvl::CtranNvl(CtranComm* comm) {
       myLocalRank,
       nLocalRanks,
       statex->localRankToRanks());
-  FB_COMMCHECKGOTO(
-      static_cast<commResult_t>(std::move(resFuture).get()), res, fail);
+  FB_COMMCHECKTHROW(static_cast<commResult_t>(std::move(resFuture).get()));
 
   this->pimpl_ = std::make_unique<Impl>();
   this->pimpl_->comm = comm;