tso: eliminate unnecessary abstractions in the allocator

[JmPotato]

What problem does this PR solve?

Issue Number: ref #8802.

What is changed and how does it work?

This commit refactors the TSO allocator components to simplify the architecture:

1. Removed the unnecessary `allocatorGroup` abstraction and its related operations
2. Simplified the relationship between `AllocatorManager` and `GlobalTSOAllocator`
3. Renamed internal methods to be more consistent with their accessibility levels
4. Removed unused code like `AllocatorGroupFilter` and consolidated configuration handling
5. Eliminated the general `Allocator` interface in favor of direct use of `GlobalTSOAllocator`
6. Made the TSO allocator loop more straightforward by removing nested function calls

The refactoring maintains all functionality while making the code more maintainable with fewer abstraction layers.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[codecov]

Codecov Report

Attention: Patch coverage is 96.26168% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.32%. Comparing base (e8050f7) to head (d945728).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9158      +/-   ##
==========================================
- Coverage   76.37%   76.32%   -0.06%     
==========================================
  Files         474      474              
  Lines       72400    72339      -61     
==========================================
- Hits        55297    55211      -86     
- Misses      13644    13668      +24     
- Partials     3459     3460       +1     

Flag	Coverage Δ
unittests	76.32% <96.26%> (∅)

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[okJiang]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-03-20 07:41:04.055260703 +0000 UTC m=+514157.739496800: ☑️ agreed by okJiang.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: okJiang
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