fix: pulsar use more memory for queue

[chyezh]

issue: #43564

[sre-ci-robot]

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.95%. Comparing base (070aabd) to head (1214a2d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/streaming/walimpls/impls/pulsar/wal.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #43565      +/-   ##
==========================================
- Coverage   78.95%   78.95%   -0.01%     
==========================================
  Files        1567     1567              
  Lines      224715   224718       +3     
==========================================
- Hits       177419   177416       -3     
- Misses      40866    40874       +8     
+ Partials     6430     6428       -2     

Components	Coverage Δ
Client	79.47% <ø> (ø)
Core	74.03% <ø> (+<0.01%)	⬆️
Go	79.89% <50.00%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
...ming/walimpls/impls/pulsar/backlog_clear_helper.go	68.60% <100.00%> (+0.36%)	⬆️
pkg/streaming/walimpls/impls/pulsar/wal.go	66.66% <0.00%> (-0.57%)	⬇️

... and 29 files with indirect coverage changes

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[mergify]

@chyezh cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@chyezh cpp-unit-test check failed, comment rerun cpp-unit-test can trigger the job again.

[chyezh]

rerun cpp-unit-test

[chyezh]

/run-cpu-e2e

[mergify]

@chyezh cpp-unit-test check failed, comment rerun cpp-unit-test can trigger the job again.

[chyezh]

rerun cpp-unit-test