fix missing header on examples

[henrique]

The profiler headers reference ncclResult_t which is declared in err.h

Errors building CoMMA example:
Unable to generate bindings for third_party/nccl/ext-profiler/example/nccl/profiler.h: clang diagnosed error: third_party/nccl/ext-profiler/example/nccl/profiler_v5.h:124:3: error: type name requires a specifier or qualifier
third_party/nccl/ext-profiler/example/nccl/profiler_v5.h:132:3: error: type name requires a specifier or qualifier
third_party/nccl/ext-profiler/example/nccl/profiler_v5.h:132:18: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
third_party/nccl/ext-profiler/example/nccl/profiler_v5.h:132:3: error: duplicate member 'ncclResult_t'

All 3 examples build and run fine with this tiny change.

Also use release version of CoMMA following its intructions https://cloud.google.com/ai-hypercomputer/docs/nccl/configure-comma#build-from-source

Thank you!

[Kaiyuan-Zhang]

FYI, #1848 is trying to fix the same missing header issue.