fix stuck insert by binding buffer and chan to ensure proper notification

[tinswzy]

#41918 #42482 #42049 #42513

cherrypick: sn release memory after pop from heap
wp: Encapsulate buffer and chan into a single item for one-to-one management and cleanup

[mergify]

@tinswzy

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.54%. Comparing base (c5adc09) to head (60d5c32).
Report is 12 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #42505       +/-   ##
===========================================
+ Coverage   73.01%   80.54%    +7.52%     
===========================================
  Files         335     1541     +1206     
  Lines       30965   219220   +188255     
===========================================
+ Hits        22609   176566   +153957     
- Misses       8356    36301    +27945     
- Partials        0     6353     +6353     

Components	Coverage Δ
Client	79.36% <ø> (∅)
Core	72.66% <ø> (-0.35%)	⬇️
Go	82.07% <100.00%> (∅)

Files with missing lines	Coverage Δ
internal/streamingcoord/server/broadcaster/task.go	100.00% <100.00%> (ø)
...ngnode/server/wal/interceptors/timetick/ack/ack.go	93.93% <100.00%> (ø)
...er/wal/interceptors/timetick/ack/last_confirmed.go	100.00% <100.00%> (ø)
...l/streamingnode/server/wal/utility/message_heap.go	100.00% <100.00%> (ø)
pkg/util/typeutil/heap.go	93.54% <100.00%> (ø)

... and 1220 files with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[czs007]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, tinswzy

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[mergify]

@tinswzy E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

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

[mergify]

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

[tinswzy]

rerun cpp-unit-test

[czs007]

/lgtm