[fix][ml] Reset individualDeletedMessagesSerializedSize after acked all messages.

[mattisonchao]

Motivation

We should reset individualDeletedMessagesSerializedSize if all the message is acknowledged. (no more individualDeletedMessages)

Modifications

• Reset individualDeletedMessagesSerializedSize=0 when the individualDeletedMessages.isEmpty()

Verifying this change

• Make sure that the change passes the CI checks.

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[codecov-commenter]

Codecov Report

Merging #19428 (8066be8) into master (3d8b52a) will increase coverage by 36.78%.
The diff coverage is 33.48%.

@@              Coverage Diff              @@
##             master   #19428       +/-   ##
=============================================
+ Coverage     27.22%   64.01%   +36.78%     
- Complexity     6264    26135    +19871     
=============================================
  Files          1644     1831      +187     
  Lines        123745   133979    +10234     
  Branches      13495    14741     +1246     
=============================================
+ Hits          33693    85766    +52073     
+ Misses        84932    40397    -44535     
- Partials       5120     7816     +2696     

Flag	Coverage Δ
inttests	24.87% <17.23%> (?)
systests	25.48% <10.85%> (-0.02%)	⬇️
unittests	61.24% <31.44%> (+43.68%)	⬆️

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

Impacted Files	Coverage Δ
...ker/loadbalance/extensions/BrokerRegistryImpl.java	0.00% <0.00%> (ø)
...xtensions/channel/ServiceUnitStateChannelImpl.java	0.96% <0.00%> (+0.96%)	⬆️
...balance/extensions/store/LoadDataStoreFactory.java	0.00% <0.00%> (ø)
...e/extensions/store/TableViewLoadDataStoreImpl.java	0.00% <0.00%> (ø)
.../apache/pulsar/client/api/MessageAcknowledger.java	0.00% <ø> (ø)
...rg/apache/pulsar/client/impl/PulsarClientImpl.java	73.91% <ø> (+25.13%)	⬆️
...ent/impl/UnAckedTopicMessageRedeliveryTracker.java	7.14% <0.00%> (+7.14%)	⬆️
...pulsar/client/impl/UnAckedTopicMessageTracker.java	43.75% <0.00%> (+31.25%)	⬆️
...che/pulsar/io/elasticsearch/client/RestClient.java	84.69% <ø> (+84.69%)	⬆️
...n/coordinator/impl/MLTransactionMetadataStore.java	75.64% <ø> (+75.64%)	⬆️
... and 1355 more