puller: close kvclient correctly when stopping a processor (#11957)

[ti-chi-bot]

This is an automated cherry-pick of #11957

What problem does this PR solve?

Issue Number: close #11954

What is changed and how it works?

When stopping a processor, close the associated puller.

Check List

Tests

• Manual test (add detailed scripts or steps below)

[2024/12/31 16:21:32.261 +08:00] [INFO] [multiplexing_puller.go:331] ["MultiplexingPuller exits"] [namespace=default] [changefeed=x3_owner_ddl_puller]
[2024/12/31 16:21:32.270 +08:00] [INFO] [multiplexing_puller.go:366] ["MultiplexingPuller is closed"] [namespace=default] [changefeed=x3_owner_ddl_puller]
[2024/12/31 16:21:32.273 +08:00] [INFO] [multiplexing_puller.go:331] ["MultiplexingPuller exits"] [namespace=default] [changefeed=x3]
[2024/12/31 16:21:32.273 +08:00] [INFO] [multiplexing_puller.go:366] ["MultiplexingPuller is closed"] [namespace=default] [changefeed=x3]
[2024/12/31 16:21:32.273 +08:00] [INFO] [multiplexing_puller.go:331] ["MultiplexingPuller exits"] [namespace=default] [changefeed=x3_processor_ddl_puller]
[2024/12/31 16:21:32.273 +08:00] [INFO] [multiplexing_puller.go:366] ["MultiplexingPuller is closed"] [namespace=default] [changefeed=x3_processor_ddl_puller]

With the patch, when removing a changefeed, all pullers for owner_ddl, processor_ddl and source_manager are closed.
No goroutine leak happens any more.

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[codecov]

Codecov Report

Attention: Patch coverage is 41.37931% with 17 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@0e6b44f). Learn more about missing BASE report.

Additional details and impacted files

Components	Coverage Δ
cdc	59.7139% <0.0000%> (?)
dm	50.0673% <0.0000%> (?)
engine	53.1997% <0.0000%> (?)

Flag	Coverage Δ
unit	55.1997% <41.3793%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             release-8.5     #11982   +/-   ##
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  Coverage               ?   55.1997%           
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  Files                  ?       1002           
  Lines                  ?     136575           
  Branches               ?          0           
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  Hits                   ?      75389           
  Misses                 ?      55671           
  Partials               ?       5515           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hicqu

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[wuhuizuo]

/test pull-dm-compatibility-test

[wk989898]

/test pull-dm-compatibility-test

[wk989898]

/test pull-dm-compatibility-test