Use SetNameSimple instead of SetName to avoid deadlock

[chenBright]

What problem does this PR solve?

Issue Number: resolve #3104

Problem Summary:

What is changed and the side effects?

Changed:

Side effects:

• Performance effects:

• Breaking backward compatibility:

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Check List:

• Please make sure your changes are compilable.
• When providing us with a new feature, it is best to add related tests.
• Please follow Contributor Covenant Code of Conduct.

[Copilot]

Pull Request Overview

This PR addresses a deadlock issue (#3104) by replacing PlatformThread::SetName calls with a new SetNameSimple variant across various thread initialization functions. The change introduces SetNameSimple as a lighter-weight alternative that sets only the OS-level thread name without the additional overhead of ThreadIdNameManager operations that could cause deadlocks.

• Introduces SetNameSimple method that bypasses ThreadIdNameManager and tracked objects
• Refactors SetName to call SetNameSimple internally, maintaining existing functionality
• Updates all thread entry points to use SetNameSimple instead of SetName

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/butil/threading/platform_thread.h	Declares new SetNameSimple static method
src/butil/threading/platform_thread_linux.cc	Implements SetNameSimple and refactors SetName to use it
src/butil/threading/platform_thread_mac.mm	Implements SetNameSimple and refactors SetName to use it
src/butil/threading/platform_thread_freebsd.cc	Implements SetNameSimple and refactors SetName to use it
src/bvar/variable.cpp	Updates bvar_dumper thread to use SetNameSimple
src/bvar/detail/sampler.cpp	Updates bvar_sampler thread to use SetNameSimple
src/bvar/collector.cpp	Updates collector grabber and dumper threads to use SetNameSimple
src/bthread/timer_thread.cpp	Updates brpc_timer thread to use SetNameSimple
src/bthread/task_control.cpp	Updates worker threads to use SetNameSimple
src/bthread/execution_queue.cpp	Updates ExecutionQueue thread to use SetNameSimple
src/brpc/details/usercode_backup_pool.cpp	Updates user code runner thread to use SetNameSimple

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[yanglimingcn]

why ThreadIdNameManager case deadlock

[chenBright]

why ThreadIdNameManager case deadlock

Still not sure why. It's strange that new ThreadIdNameManager blocks and causes other threads to wait for the ThreadIdNameManager to be constructed.

[wwbmmm]

LGTM

[yanglimingcn]

LGTM

[chentingkai00301]

why ThreadIdNameManager case deadlock

In the sampling thread, after SetName enters the lock, the main thread performs a fork. When the child process acquires memory, it is locked, causing all threads in the child process to get stuck.