[Feature] Use mem_pool property to create shared mem_tracker across resource groups (backport #64112)

[martinr0x]

Why I'm doing:

See this PR

What I'm doing:

Adding a new class shared_mem_tracker_manager. This class manages shared_mem_tracker and will return the same mem tracker for the same mem_pool.

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 4.0
  • 3.5
  • 3.4
  • 3.3

---

Note

Introduce a shared MemTracker per mem_pool and wire it into WorkGroup creation/initialization, adding a new tracker type, Thrift field, and tests.

• WorkGroup / Manager:
  • Add mem_pool to WorkGroup (ctor, accessors) and accept parent mem tracker in init to support shared pools.
  • Create MemTrackerManager to return a shared parent MemTracker per mem_pool; integrate in WorkGroupManager::create_workgroup_unlocked.
  • Provide default DEFAULT_MEM_POOL and handle default vs custom pools.
• Runtime / MemTracker:
  • Add MemTrackerType::RESOURCE_GROUP_SHARED_MEMORY_POOL and corresponding error message.
  • Expose GlobalEnv::query_pool_mem_tracker_shared().
• Thrift:
  • Extend TWorkGroup with optional mem_pool.
• Build & Tests:
  • Register new sources in CMake.
  • Add UTs for shared tracker behavior and manager integration; adjust existing tests to new WorkGroup ctor/init API.

^{Written by Cursor Bugbot for commit 9f41d21. This will update automatically on new commits. Configure here.}

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[murphyatwork]

/root/starrocks/be/src/exec/workgroup/work_group.cpp:160:21: error: ‘const starrocks::_TWorkGroup__isset’ {aka ‘const struct starrocks::_TWorkGroup__isset’} has no member named ‘mem_pool’
  160 |     if (twg.__isset.mem_pool) {
      |                     ^~~~~~~~
/root/starrocks/be/src/exec/workgroup/work_group.cpp:161:25: error: ‘const class starrocks::TWorkGroup’ has no member named ‘mem_pool’
  161 |         _mem_pool = twg.mem_pool;
      |                         ^~~~~~~~
make[2]: *** [src/exec/CMakeFiles/Exec.dir/build.make:4122: src/exec/CMakeFiles/Exec.dir/workgroup/work_group.cpp.o] Error 1

@martinr0x