Prepare test_inductor_collectives.py for native funcol migration (#120025)
There are some tests in this file that are impl specific, e.g. verifying generated code via `FileCheck`. These tests are covered for native funcol in test_c10d_functional_native.py, therefore marking them with `@run_with_legacy_funcol`.
Other tests are marked with `@run_with_both_funcol_impls`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120025
Approved by: https://github.com/wanchaol
ghstack dependencies: #119982
