receive_and_buffer with external_worker

[tao-stones]

Problem

• receive_and_buffer uses root bank for both ALT loading and vote-only checking,
• External worker uses receive_and_buffer code to translate transaction,

Summary of Changes

• use working bank for vote-only checking, root for ALT loading
• update External worker accordingly

Fixes #

[codecov-commenter]

Codecov Report

❌ Patch coverage is 31.81818% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.6%. Comparing base (108e725) to head (7fcfae1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #9212     +/-   ##
=========================================
- Coverage    82.6%    82.6%   -0.1%     
=========================================
  Files         890      890             
  Lines      320852   320861      +9     
=========================================
- Hits       265305   265285     -20     
- Misses      55547    55576     +29     

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[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[t-nelson]

sigh