fix(batch): refine local compute context

[chenzl25]

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What's changed and what's your intention?

• Sysbench shows that this test-oriented memory context consumes about 5% CPU of CN.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ff90f8c) 68.31% compared to head (6c26093) 68.31%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/batch/src/task/context.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13688   +/-   ##
=======================================
  Coverage   68.31%   68.31%           
=======================================
  Files        1523     1523           
  Lines      261834   261833    -1     
=======================================
  Hits       178879   178879           
+ Misses      82955    82954    -1     

Flag	Coverage Δ
rust	68.31% <0.00%> (+<0.01%)	⬆️

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