[fix](exchange)fix exchange sink buffer does not update total_queue_size when EOF. (#47312)

[jacktengg]

#41602
EOF clears _instance_to_package_queue but does not update total_queue_size, causing incorrect judgments that rely on total_queue_size.

UT

mock transmit_blockv2 dest ins id :1
mock transmit_blockv2 dest ins id :2
mock transmit_blockv2 dest ins id :3
queue size : 6
each queue size :
Instance: 2, queue size: 2
Instance: 1, queue size: 2
Instance: 3, queue size: 2

queue size : 6 // error size
each queue size :
Instance: 2, queue size: 0
Instance: 1, queue size: 2
Instance: 3, queue size: 2

mock transmit_blockv2 dest ins id :1
mock transmit_blockv2 dest ins id :1
mock transmit_blockv2 dest ins id :3
mock transmit_blockv2 dest ins id :3

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

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[Thearas]

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