The bazel build thread can sometimes have exceptions, and the scons build may progress without bazel having been able to ensure the bazel build files are up to date.

We should remove the cruft line at https://github.com/10gen/mongo/blob/c459ec735b197a12ac47258c049bca3bb4b5a00e/site_scons/site_tools/integrate_bazel.py#L231 which causes BF-32367

as well as make the thread ensure that the bazel build ran successfully and then where we later wait on the bazel build thread to finish, fail the build if the bazel build did not confirm successful run.