Add FlightRecorder tests

[frost-intel]

As a follow-up to #1867 , this PR includes tests for the FlightRecorder on XCCL, as well as moving some definitions from ProcessGroupXCCL::Options to Backend::Options.

These tests are largely based on pytorch/test/distributed/test_c10d_nccl.py, but doesn't include some tests:

• test_short_json since json dumps are not supported in ProcessGroupXCCL
• test_trace_while_all_works_retired: _wait_for_pending_works isn't supported by XCCL
• test_trace_while_active: XCCL hangs when op is called on only one rank
• test_trace_while_stuck: XCCL hangs when op is called on only one rank

[Copilot]

Pull Request Overview

This PR adds FlightRecorder tests for XCCL (Intel XPU Collective Communications Library) as a follow-up to #1867. The tests validate flight recording functionality for distributed operations on Intel XPU devices, including trace dumping, timing, and various collective operations.

• Adds comprehensive test suite for XCCL FlightRecorder functionality based on NCCL tests
• Moves global_ranks_in_group and group_name from ProcessGroupXCCL::Options to Backend::Options
• Adds conditional recording parameter to initWork method to control when flight recording occurs

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
test/xpu/distributed/test_c10d_xccl.py	Adds XCCLTraceTestBase and XCCLTraceTest classes with comprehensive flight recorder tests
src/xccl/ProcessGroupXCCL.hpp	Removes group-specific options and adds record parameter to initWork method
src/xccl/ProcessGroupXCCL.cpp	Implements conditional flight recording and fixes sequence counting logic

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[Chao1Han]

Hi @frost-intel, could you apt install clang-format and format ProcessGroupXCCL.cpp/ProcessGroupXCCL.hpp before push code.
Avoid periodic code cleanup like https://github.com/intel/torch-xpu-ops/pull/1960/files

[guangyey]

@frost-intel The UT failure is related?

[frost-intel]

@guangyey Yes, the UT is related. I'm unable to reproduce the error on Borealis/Aurora. It seems like the final collective isn't being registered as complete

[frost-intel]

@zhangxiaoli73 This is also ready for merge. Do we need a 2nd reviewer?

[frost-intel]

@zhangxiaoli73 I don't have permission to merge. I assumed you did.

@guangyey Can you merge this?

[dvrogozh]

I wish we had XCCL related code and tests right in the pytorch repo. This way we could work to unify the test code. As of now this test seems to be a huge duplication which is hardly reviewable thoroughly. But to make things going, I guess we need to merge this in.